Why can’t I use Viber on some Wi-Fi networks?

If you are connected to Wi-Fi and you are able to browse the web, but still cannot establish a Viber call, the most probable cause is that the required ports are closed.

The ports which are used by Viber are:
TCP: 5242 and 4244
UDP: 5243 and 9785

You should enable those ports (ingoing and outgoing) on your router and your firewall. If it is not your private network, you should contact the network administrator.

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If you are having technical problem on using Viber, please provide as much information as you can: what device and OS you are using, is your device jailbroken iPhone or Android with custom ROM, what country and what mobile operator you are on, is the problem related to 3G or to WI-FI connection...
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  • guest

    Thnx says Battie

  • Sarah

    I HAVE VIBER INSTALLED, BUT IT STATES THAT SERVICE IS DISCONNECTED.
    WHAT DOES IT MEAN THAT THE SERVICE IS DISCONNECTED? IS THIS FROM THE SERVICE PROVIDER?

    • ViberTeam

      No, it means your phone is unable to connect to Viber's service.
      1. Are you connected to WiFi or 3G? What country are you located in?
      2. Did you try reinstalling Viber from Market?

      • guest

        Hi Viber! I have the same problem like Sarah.
        1. I used WiFi connection. I am from Romania (certainly different as Sarah).
        2. I set the the router ports that work Viber.
        3. I installed twice times. But every time the same problem.
        4. I have a Chinese dual-sim phone with Android 2.2.1
        5. Excuse my english.

        • http://www.viber.com Viber

          Your English is fine :)

          Please test Viber on your Android when connected to a few different WiFi networks. Does this problem occur on all of them?

          • guest

            I tested again, (I recognize in the same WiFI network). Now disappeared the message:”service is disconnected”. But I think the program work in background and when is displayed on the screen appears as is running and at a time disappeared in background. I think the phone is not able to run this program. I don’t know. The phone have CPU MTK6516 (416MHz) and 256 MB RAM.

          • http://www.viber.com Viber

            What phone do you have? Which version of Android?

            Also – are you running a Custom ROM?

          • guest

            This the phone: (I don’t know if I have rights to publish a link):
            http://www.mixmelot.com/sku-26067
            Many times it is possible to not correspond the written specifications with the real phone.
            I don’t understand “-are you running a Custom ROM?” You refer to TF card which it is 2GB Knigston TF card?

          • http://www.viber.com Viber

            Please note that Viber does not officially support your device yet, and that may be the reason for the problems you are experiencing. Here is the full list of officially supported devices: http://bit.ly/rqbZEw

            We are continuously working to adapt Viber to more and more devices, and we hope to attend to the problems with your device soon. We apologize for the inconvenience.

          • http://www.viber.com Viber

            Hi,
            What device do you have? Which version of operating system?

  • Amy

    iv got the same problem as well.
    a few days ago my viber worked perfectly fine on the network in currently trying to use
    today, however it says "service disconnected!"
    im using an android phone
    any comments on what this problem could be?
    thanks for the help

    • ViberTeam

      @Amy

      Does the problem still persist?
      Please take a look at the questions I asked Sarah above, and reply to me with your answers, so we can try and identify the problem.

  • Louis

    Besides ports
    TCP: 5242 and 4244
    UDP: 5243 and 9785
    you will also need to allow port
    7985 UDP
    Cheers,
    LMHORTA

    • http://www.viber.com Viber

      7985 UDP port is not a Viber port. You probably mean 9785, and this port was specified above.

  • Jeltusan

    I would like to use Viber via my NetCom mobile phone network (with which I have an Internet access). Is that possible? It doesnt work with the WiFi network on my work and I am reluctant to ask our IT to sort it out

    • http://www.viber.com Viber

      If NetCom is a 3G network, then yes, you should be able to use Viber on it just fine.

      About your work WiFi – well, it’s up to you ;)
      We gave you the ports that should be opened, all you have to do is give them that information.

  • Arunakiran

    I m using Motorola flipout (android version 2.1) And i downloaded Viber through market, but i m facing the prb tht my voice is not reaching to other side….at the same time with my iPod i m enjoying Viber calls…so its clear my n/w connections and settings r gud…so plz help me out in this regard

  • Rahul_nrg

    i had installed viber almost a month ago knowing that it would be blocked for usage as i live in oman.

    (fyi: my wifi is free but i don’t own one.)

    however, a few days ago, i was surprised to see that viber got connected and i was able to place free calls and send messages. then, to just make sure that this wasn’t a glitch, i restarted my phone and viber as well. the result shows that it remained disconnected for a bit and then tried to connect. connecting the service took a very long time and i figured it had something to do with the connection speed of my wifi. after hours, it gets connected and i am able to place free calls and send messages.

    now the problem i face is that when i place or receive calls, i can’t hear the person on the other end (who also uses viber). the call goes and comes through, but while calling, the person on the other end claims that when she answers the call, she is not able to hear me speak. viz-a-vie when she calls and when i answer, i am not able to hear her. does this have to do with my connection speed again or something else?

    also, sending messages is not a problem. they work!

    for aesthetics, the receiving ring tone is quite shabby and so is the message sending and receiving notification tones.

    • http://www.viber.com Viber

      Hmm… strange.

      As far as we understood, the block in Oman simply doesn’t allow all users within it to use Viber (meaning it is the same block as in the UAE).

      The problem you are describing *could* theoretically be caused by a VERY low internet connection, but I don’t think this is the case. You can simply test it by trying out other VoIP applications and comparing. For example: Skype.

      It is more likely that VoIP was blocked, but the fact that you can send/receive messages confuses me. Which ISP is your WiFi connected to?

      Let’s do this -
      1. find other WiFi network, and see if the problem persists.
      2. have a friend in Oman check Viber on their phone. Is it the same?

      • Rahul_nrg

        I totally agree with you! This confused me as well!

        Being blocked in Oman, would practically mean that any use of VoIP services would be futile. But surprisingly, Viber actually works! I am able to place calls and receive like I mentioned. Only drawback is that the call does not go through. Although sending messages work like a charm! In fact, somewhat faster than Whatsapp! I tried the same by logging in with Skype but no dice! Very strange indeed!

        As far as ISPs are concerned, I use both Nawras and Omantel.

        Nawras WiFi is used at home (a rented out flat), from a common building/floor router which obviously is quite slow, but after a bit of time, it manages to connect Viber thereby enabling me to place and receive calls and send messages as well.

        Where I work, at the hotel, I obviously have access to free WiFi, which is provided by Omantel, which also surprisingly, connects Viber (in lesser time than at home) and enables me to do everything that Viber provides me to do.

        Only drawback again in both places and by both ISPs, the calls don’t go through, whether its made or received, but messaging works!

        As of right now, I am writing to you from the hotel accommodation where I currently reside. The internet provided here is much slower than what I use at home. But Viber says “connecting to service…” which clearly means, it is attempting to connect.

        I will ask one of my friends to download Viber and test this out.

        • http://www.viber.com Viber

          Great. I’ll be waiting for the results :)

  • Serge

    When I’m connected via WiFi and try to place a call using Viber it says “Viber service is currently
    unavailable or being blocked…” and messages never reach their destination (I get a red exclamation mark icon near them). But when I’m connected via 3G it works fine.
    The WiFi I’m using is my personal at home and I know there’s no firewall on the router that could be blocking the aforementioned ports.
    What could be the reason for this problem?
    I live in Israel if that helps.

    • http://www.viber.com Viber

      Hmm.. it does sound after all as if you do have a firewall, or at least that your router is blocking ports. Did you check it?

      Enter your router’s configuration, and make sure the following ports are open:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      • Serge

        I solved the problem by entering the device’s IP undress in the router’s DMZ.

        • Serge

          address*

          • http://www.viber.com Viber

            That could also be a solution :)

            Good, enjoy Viber!

  • Serge

    Maybe I should add that when I’m connected to my neighbour’s unsecure network it also works fine, mine is secure with WPA2 (using passphrase).

  • Jorge Centellas Ayala

    I have firewall and all the ports are open, but when I call to someone in the same place, i have my viber ringing and the other person answer but no leasen nothing.

    • http://www.viber.com Viber

      Please try using Viber on a different WiFi network. Does it work now?
      If so, then the problem is still somewhere with your local WiFi network.

  • Alimrahoojo

    If viber works on iphone 2G
    Ali

    • http://www.viber.com Viber

      Viber officially supports iPhone 3G and above. Viber *might* work on your 2G, but even if it does, it’s not going to be fully compatible.

  • hugh

    Hi there, just wanted to inform you about a little typing mistake in your “Why can’t I use Viber on some Wi-Fi networks?” article. You accidentally typed “abale to browse” instead of “able to browse” :D .

    I think this application will be the future! You should consider programming a desktop version because Skype is just not staying on top of the situation when it comes to Mac users!

    • http://www.viber.com Viber

      Viber for PC/Mac – in the works already :)

      • hugh

        Niiicceee :D
        One thing you should take a look at is the heat problem Skype causes on Macs! I bet a lot of people will be interested in a Skype alternative that doesn’t turn your laptop into a frying pan ;)
        I think reducing the isight framerate will take care of part of the heat problem… depending if you are planning to embed video calls at all.

        However I’m happy to see that some people are developing great stuff ;)
        Keep up the good work!

        Cheers,
        Hugh

    • Anonymous

      Thank for pointing that out.
      It is fixed now.

  • Sargue

    Weird. How can I open ports for more than one device on the same wi-fi? Tricky, if not impossible. That prevents using Viber for me and my wife, and anyone visiting and having a dynamic internal address.

    Sucks a bit, IMHO. It seems to me you’re trying to make direct connections (to save on bandwith?).

    • http://www.viber.com Viber

      Opening ports is an action you make in your own network, regardless of how many devices you use. If your network is set in a way that 2 network identities collide with each other, then there’s not much we (Viber) can do to help, since it’s not something we can control in any way.

      If I misunderstood your problem, please try to explain again and elaborate.

      • Sargue

        I will try to explain with an example.

        Two smartphones with Viber, on the same home LAN with an ADSL router providing internet access.

        Smartphone A with Viber: 192.168.1.7
        Smartphone B with Viber: 192.168.1.8

        Let’s use port TCP 5242 for the example (the first one from your list).

        Please, tell me how can I open that port (which I understand as a NATP mapping on my router) for BOTH devices. I surely can redirect it to the A device or the B device, but not both!

        • http://www.viber.com Viber

          Why not for both?
          If you have many computers on the same LAN network, and they all browse the internet, they all use port 80, and they all work together without any collisions.

          Simply try it out – connect a few smartphones with Viber on the same LAN network and see for yourself that it works just fine. If it doesn’t work – then there’s a different problem.

  • http://twitter.com/SnitchPurple187 Sergio Espina

    But how do I get to my firewall settings on Windows 7? Please help!!

    • http://www.viber.com Viber

      Note that other than firewall settings this issue can be related also to your router configuration.

      For more information on how to change these settings you may google it or contact your router supplier.

  • Cliff

    Does viber use UPnP to open the ports it needs?

    • http://www.viber.com Viber

      If you meant to ask if Viber uses UPnP ports (1900, 2869) then no, Viber uses the following ports:

      TCP: 5242 and 4244
      UDP: 5243 and 9785

      • LoyalViberUser

        Hi, I’ve recently moved and activated those ports as instructed but Viber works only occasionally e.g. I can sometimes receive a message but not send a message. And voice calling on Viber almost always does not work. Are there additional ports that Viber uses? Please advise.

        • http://www.viber.com Viber

          Hmmm…
          Are you sure you enabled these ports correctly?

          Please try to run a quick test by trying Viber out on a few different WiFi networks. See if the same problem (functioning occasionally) happens also there.

  • Jessica

    I’m trying to use Viber in my iPod, while connected to my university’s wifi.
    I really don’t how to configurate the ports, could you please help me?
    Thank you. :)

    • http://www.viber.com Viber

      You need to contact the network administrator or simply Google it.

  • Rahul_nrg

    I have some rather strange but really good news for you guys from Viber!

    My Viber connected yesterday and not only was able to place calls, receive calls, send and receive messages, but also HEAR the person on the other end!

    I was absolutely excited but after having a long 2 hours conversation, I began thinking why on earth did it connect! If Oman regulations are so strict in blocking such services, why did this work?

    Anyways, I will let you know in a few hours if I am able to connect and talk with my friends today as well!

    • http://www.viber.com Viber

      Hi Rahul,
      Thanks for this great feedback, we’d be delighted to hear more about it when you have any news :)

      • Rahul_nrg

        :D

  • Rahul_nrg

    The only issue I now face has to do with my blue tooth device. I enabled the feature in the program in order to let me talk using my BT device. But it won’t let me! Am I missing something?!

    • http://www.viber.com Viber

      Hi Rahul,
      What device do you use?
      iPhone should work properly.
      Regarding Android, it’s partially supported at the moment.
      We suggest you to check this webpage which we keep updating for more information: http://helpme.viber.com/index.php?/Knowledgebase/Article/View/78/0/android-beta-viber-general-information

      • Rahul_nrg

        Samsung Galaxy S2. Thought you I had mentioned that in my previous posts! Any who… I tried accessing your help me page but of course Omantel decided to block the page. Is there any way you could email me a link to any other forum perhaps?

        • http://www.viber.com Viber

          You mean the information itself?

          • Rahul_nrg

            yes! :(

          • http://www.viber.com Viber

            It’s useless since we keep updating it. :/
            We are about to release a new version within the next several days, please try it out and if the issue persist please contact us again for more information.

  • Jayhvasani

    how can i open port 5242,4244,5243,9785 from router and from firewall. plz reply

    • http://www.viber.com Viber

      You need to contact your internet/router provider support.

  • Rahul_nrg

    By the way guys, I just bought an iPod touch 4. It seems that I could install Viber on it but I can’t use it yet till you working on it for iPod and iPad compatibility.

    • http://www.viber.com Viber

      The official versions of Viber for iPad and iPod are in the works, however, Viber already works on these devices.

  • Josip Marich

    Hi i am using viber on iphone on wifi and my girlfriend on androdid on 3g, and when we talk i get huge delay when i’m talking and i hear myself in speaker. i really would like some help. thank you

    • http://www.viber.com Viber

      3G networks can sometimes be disrupted and consequently affect the quality of VoIP calls. We are working on adding a feature that will adapt to disruptions in order to ensure stable calls on 3G networks. In general, WiFi- WiFi calls on Viber sound clear and are free of such disruptions.

      Please try a WiFi-WiFi call and see if it’s different. This information will help determine the source of the problem.

      • Josip Marich

        wifi – wifi works fine, but 3g has distruptions….

  • Rahul_nrg

    Excellent news! Viber works very well on my iPod and Samsung Galaxy S2. Only requirement is a very good internet connection. Only few but small issues persist as far as bluetooth connectivity is concerned with my Galaxy and the ringtones! Sound quite cheesy! ;P

    • http://www.viber.com Viber

      Bluetooth – we’re continuously working to improve Viber’s integration with Bluetooth. We hope that in our next updates, there will be serious improvements.

      Ringtone – we will add an option to alter Viber’s ringtone in the future.

  • Mcmwh

    “Viber service is currently unavailable or being blocked. Please try again later. Place a regular call instead?”
    On vodafone network I cannot use viber because I think they have blocked in their network functionality of voip apps like viber

  • Mcmwh

    on htc desire

    • http://www.viber.com Viber

      What country are you located in? Which cellular network?

  • Lashe_2708

    the viber in my ipod touch is working properly until yesterday.i tried to delete and install it again but when i am trying to get a code, it says could not connect to the viber access.please check your connection and try again. what does it mean?im using wi-fi in my house.

    • http://www.viber.com Viber

      Please remove Viber, wait 24 hours, then try again. This time, try registering also on different WiFi networks, in order to identify the source of the problem.

  • Roy

    hi, i’m using iphone 4 ios5, when someone call me on viber i can see it and hear it but if i push “answer” few seconds and then disconnect, then tried to make a call it says ” could not connect to the viber service”, please help, i deleted the app then reinstall it same problem.

    • http://www.viber.com Viber

      Please try testing Viber on different networks (3G and different WiFi networks) and see if the problem is the same on all of them.

  • akh

    Hi, I can use viber fine with Wap wifi network. But when I try to use viber with a wifi network that needs authentication I get the message “cannot connect …” I am using a Galaxy S I9000 with proxydroid. Please help

    • http://www.viber.com Viber

      What kind of authentication does the network require?
      Also – did you make sure that the network enables Viber’s ports?

      These are the ports:

      TCP: 5242 + 4244
      UDP: 5243 + 9785

      • Akh

        Thanks for your prompt reply
        The network uses a proxy that needs a username and password. I had the same problem with skype but when I installed on my phone Proxydroid I overcomed the problem for skype but not for viber. For the proxy port on Proxydroid I changed it from 8080 to 5242 without success. Thanks in advance

        • http://www.viber.com Viber

          All Viber ports need to be open, not only 5242. If this network allows a single port (only) to be opened, unfortunately it’s not enough and Viber won’t be able to function properly :(

      • Ricardo

        Good mornig.
        Have a way to open ports to use in 3g network with proxy on Android device? My internet is Vivo 3g with proxy. When a try to call the Viber give me a message its not working.

        • http://www.viber.com/ Viber

          Hi Ricardo,
          Which 3G network are you using?

          The answer to your question can probably be found either in Android forums, or by contacting your mobile operator.

  • Jeabjaz

    Hi I just upgraded my Viber to new version 2.1.1.126 since it has been upgraded I can’t make a call or received a call thru Viber anymore can you please assist.

    • http://www.viber.com Viber

      What exactly do you see when you try to make a call?
      Also – did you try uninstalling, then installing again?

  • Stephen

    I am using Viber… works fine until I hit the hotels… any idea how I can wrap the network packets to get them through the hotel firewalls… they will not open up the ports so looking for an alternative method to get it working.

    • http://www.viber.com Viber

      Unfortunately there is no workaround for this issue as of now. You need to contact the admins of the networks and have them open the following ports:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

  • Jayhvasani

    i am receiveng error like viber sevice is currently unavailable or been blocked. and i had already opened all of the ports that u listed. now what to do ?

    • http://www.viber.com Viber

      We had a temporary problem with our servers, but everything should be working well now. Please restart Viber, wait a few minutes, and see if the problem persists.

      • Jayhvasani

        ya sir then also i am receiving error like viber is unavailable or blocked . when i am starting viber. its auto detecting onether contry code. but when viber is working properly its detect my country. and i had changed my android phone and other ur requirements . is there any other option that i can use it easily. or when u will launch viber for blackberry or for nokia. sir i m contacting u from last 2 or 3 months. no solution for me . please do something if it is possible.

        • http://www.viber.com Viber

          We haven’t encountered a similar problem so far so it’s hard for us to provide you with a solution.

          What country do you live in? Which cellular network are you using?

          • Jayhvasani

            i am living in india and i m using airtel network. it connects with 3g easily but cant work with wifi.

          • http://www.viber.com Viber

            If Viber works fine on your 3G network but fails to work on WiFi, then your WiFi might be blocking Viber’s ports.

            Please read the instructions at the top of this page and enable the ports specified there in your Router. If you don’t know how to access your router and open these ports, contact the router’s manufacturer or Google it for instructions.

  • Sserwaddabm

    hi,when i ring or when they ring ,they cant hear me at all yet i hear them clearly,i have uninstalled and installed viber severally but it can not help me at all. any help is appreciated.

    • http://www.viber.com Viber

      What device are you using?
      Which OS version?
      Is your phone Jailbroken or (if it’s Anroid) running a custom ROM?

  • Jayhvasani

    ya sir then also i am receiving error like viber is unavailable or blocked . when i am starting viber. its auto detecting onether contry code. but when viber is working properly its detect my country. and i had changed my android phone and other ur requirements . is there any other option that i can use it easily. or when u will launch viber for blackberry or for nokia. sir i m contacting u from last 2 or 3 months. no solution for me . please do something if it is possible.

  • Kanzaki GNT

    Hello,

    Is there a way to know, on my network, if the required ports are blocked?
    I’m in France, using the University internet connection and it doesn’t seem to work. However it works perfectly well in 3G.

    • http://www.viber.com Viber

      Usually universities allow only port 80 (websites, HTTP), so unfortunately it is likely that they block Viber’s ports. You can contact the admins and ask them, or simply – try to use Viber, and if it says to you that it’s being blocked – this is how you’ll know.

      • Kanzaki GNT

        Can you provide us with the exact ports Viber uses so I can manually check if they’re allowed, and perhaps ask the admins to unblock those specific ports? Thanks

        • http://www.viber.com/ Viber

          These are the ports that Viber uses:

          TCP: 5242 + 4244
          UDP: 5243 + 9785

          • Kanzaki GNT

            thank you, highly appreciated

          • http://www.viber.com/ Viber

            Our pleasure :)

            Enjoy!

          • Shakeel

            If HTTP or HTTPS port are not allow then can i use viber behind the tmg2010 firewall.

  • Jayhvasani

    i am using iphone 4 and when i m making call error is coming like COULD NOT CONNECT TO THE VIBER SERVICE. PLEASE TRY AGAIN LATER.

    • http://www.viber.com Viber

      1. Did you download the latest version of Viber?
      2. Did you try using Viber on different WiFi networks and see if it works there?

    • Jayhvasani

      ya i have a latest version of viber. and its working with other wifi networks. but not working with my wifi. and i had already opened portss from router and firewall.

      • http://www.viber.com Viber

        Then you should either contact the router’s manufacturer or your ISP – something is blocking Viber after all, and unfortunately there is not much that we could to do help :(

  • priya

    at present is viber working in oman?? desprately in need of it:(

    • http://www.viber.com Viber

      Unfortunately, as far as we know Viber is blocked in Oman completely.
      We have heard from some users that only Viber’s messaging works on certain networks (some WiFi networks and Nawras’ 3G network).

      Can you confirm that?

  • Josip Marich

    hello i updated viber now and it says no internet connection… i tried on wifi and 3g…an it doesn’t work. please help!

    • http://www.viber.com Viber

      There was a temporary issue with our servers which should be fixed now. Please try it out again and make sure it’s working properly :)

  • http://www.facebook.com/juraj.benak Juraj Benak

    Hello, I’ve opened the ports on our firewall but despite that I still can’t send nor receive messages.

    Other wireless network that has all ports open is working just fine. Is there any other port that might need to be open apart those 4?

    Thanks

    • http://www.facebook.com/juraj.benak Juraj Benak

      ok so I was able to analyze it a bit and the source port actually varies from quite a bit of range. can u specify where it starts and finishes? I set it up for all of them from 54000 to 56000 but it takes bit of time as I suspect it might start somewhere around 40k.

      thanks

      • http://www.viber.com Viber

        The ports listed above are the ports Viber is using. The ports you saw when you analyzed your network don’t belong to Viber – these are internal ports inside your network (between your phone and the router), and they are irrelevant to Viber’s functionality. In other words, the only ports that you should look at are the “Destination Ports”.

        Let’s try something else – try opening all of your UDP ports (outgoing). Does Viber work now?
        If it still doesn’t work, try opening all TCP ports (outgoing). Now, does it work?

        The results of this test (that must be done step-by-step) could help you and us analyze the problem.

        • http://www.facebook.com/juraj.benak Juraj Benak

          thanks for reply.

          Fortigate is bit more complicated device and I opened source port to the destination ports only, which didn’t work as Viber I gues is using random source ports – so I opened broader spectrum which works well now.

          • http://www.viber.com Viber

            That’s great news :)
            We’re glad it works now. Enjoy!

        • Etwllc

          Please advise how to change UDP and TCP on ipad

          • http://www.viber.com Viber

            Enabling ports happens on your router or your firewall, not on the device (iPad) itself.

            Please contact your network administrator or your router’s manufacturer for more details.

  • Anonymous

    Close the autoupdate(androidmaket) on your telefone and it will work…

  • viberlover

    hello i would like to know if viber is blocked whit my morrocan provider network ADSL or not because its several time that i want to have a call but a message error display “an internet connection is required to place viber free calls ” even if my iphone is fully connected to a wifi
    so help me please

    • http://www.viber.com Viber

      Unfortunately we are indeed suspecting that the Moroccan authorities blocked Viber recently, and now it is not possible to use it anywhere in the country.

      There is unfortunately not much we can do to help – please try contacting your cellular provider and ask for the reason for this block.

      • Ismail

        That’s not true. I live in Morocco and I’m able to use viber on wifi network as well as on 3G. If you can’ use viber, check if you have the right ports enabled on your router.

        • http://www.viber.com Viber

          Hi Islmail,
          We’ve been getting hundreds of reports from users whose Viber is blocked (both on WiFi and 3G), and our statistics show a big decrease in Viber usage in Morocco. How are you able to use Viber? Are all of your friends using Viber normally as well?

          • Ismail

            Sorry for the confusion. You must be right. But the last time I used viber on 3G network was 3 days ago. Now I can’t test because I’m away and don’t have access to 3G. But I noticed that viber doesn’t work indeed on public wifi.
            Regards

          • http://www.viber.com Viber

            Have you tried contacting the Moroccan authorities or your cellular company to ask for the reason for this block? What did they say?

  • Benagz

    Until today Viber was working properly, but today every time I try to make a call or send a message, there is a message error “Viber service is currently unavailable or being blocked. Please try again later. Place a regular call instead?”
    This is the first time I got this message.
    I am using WiFi and didn’t change nothing at all.
    I managed just once to send a message after I got this message, and afterward was again the same error message.
    Thnx

    • http://www.viber.com Viber

      There seems to be a temporary issue with our severs. We apologize for the temporary inconvenience :(

      We’re working to fix it this very moment, and we hope to resolve it ASAP

  • Jc

    i thought my phone has a problem, thank you for answering benagz’s comment, im having an issue with my connection to for the past 2 hours, i hope you can fixed this as soon as possible. Thank you viber.

    • http://www.viber.com Viber

      We assume the problem has been solved by now, yes?

  • Cpreya

    I recently installed viber in samsung ace. it work well yesterday in wi fi, but today it say Viber service is currently unavailable or being blocked. am in singapore trying to call my family in india by viber.

    • http://www.viber.com Viber

      There might have been a temporary issue blocking Viber.
      Does the problem still persist?

      If it does, then please make sure neither you nor the other side are connected to networks that might be blocking Viber (for example – a router running a firewall).

      1. First, please try uninstalling and reinstalling Viber when connected to different WiFi networks. Does it work now?
      2. Also, please make sure the following ports are enabled on your routers:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, contact your router manufacturer)

  • Davidf44

    There’s zero thought to your pathetic support. No email address, thoughtless mobile web use… Tiny font, ineffective real estate nav, rejects valid email addresses as invalid thereby disabling any support. Last but not lest your voip quality simply due is inaudibleWHAT A JOKE

    • http://www.viber.com Viber

      Hi David.
      First – please relax.

      If you are here with a technical issue or a constructive suggestion – please write it in a dignified manner and we will be more than happy to assist. Otherwise, please refrain from simply using harsh language without any real message to get across.

      Thank you.

  • Santosh Gupta037

    plz tell me wi fi meaning

  • Courtney

    My account automataclly deleted itself and now when I try to subscribe for another account my answer is “An internet connection is required to set up Viber. Check your connection and try again” … I have tried on my Wifi and my 3G (which was working just fine with Viber until today) I know I have not touched any settings in my phone… So what’s going on?

    • Danie

      I have the exact same problem, 30 minutes ago, when I hung up after a Viber-call my account was reset and it cant connect when I type my number in, says “An internet connection is required to set up Viber. Check your connection and try again”.

      • Angelowellens

        Yup same thing here

        • http://www.viber.com Viber

          We’ve been having some temporary glitches with our servers. We worked hard to fix it, and everything should be back to normal now. Please try it out and see if you still encounter problems.

    • Rima6189

      The exact thing happened woth me! It was automatically deleted and im not able to create a new account…

  • Jmak

    same for me!

    • http://www.viber.com Viber

      We’ve been having some temporary glitches with our servers. We worked hard to fix it, and everything should be back to normal now. Please try it out and see if you still encounter problems.

  • Daleila

    Hi, same with me. I even deleted the App and insalled it again, but I still get the same message. Ist this a worldwide problem, or only restricted to some countries?

    • http://www.viber.com Viber

      We’ve been having some temporary glitches with our servers. We worked hard to fix it, and everything should be back to normal now. Please try it out and see if you still encounter problems.

  • Rima6189

    Same here :/

    • http://www.viber.com Viber

      We’ve been having some temporary glitches with our servers. We worked hard to fix it, and everything should be back to normal now. Please try it out and see if you still encounter problems.

  • mrach

    same here… im here in canada. i tried to re install it many times both my wifi and 3g were open and still im getiing the same message “An internet connection is required to set up Viber. Check your connection and try again”
    please help :(

    • Danie

      I’ve even tried to reset my phone to the last savingpoint via itunes on my computer but the Viber app acts the same. And I’m in Sweden. Maybe it’s just the iphone? My friend has an android and his works fine. The most annoying thing is that mine still makes the sound and the “pre-message” pops up when people send me messages but when I click on them I get to the stupid “insert number here, but I wont connect”-page!

      • http://www.viber.com Viber

        We’ve been having some temporary glitches with our servers – we apologize for any inconvenience caused. We worked hard to fix it, and everything should be back to normal now. Please try it out and see if you still encounter problems.

    • http://www.viber.com Viber

      We’ve been having some temporary glitches with our servers. We worked hard to fix it, and everything should be back to normal now. Please try it out and see if you still encounter problems.

  • Soroush Azadvari

    I’m from Iran, same poroblem here (Viber service is currently unavailable or being blocked) :(

    • http://www.viber.com Viber

      Did you try using Viber on both the cellular network, and a few DIFFERENT WiFi networks? This problem occurs on all of them?

  • Gilbertocrisanti

    Hi, I am living in Spain and have a wifi router by Orange. My Viber was not working with wifi, but it did with 3g connection. I just solved the issue. Here it comes how I did it.
    I went to the address of my router (in my case 192.168.1.1), I logged in, I went to advanced configuration,then NAT/PAT.
    Add new rule. Rule 1: External port 5242, Internal Port 4244. Rule 2 External Port 5243, Internal Port 9785. The End. Easy
    I am so happy it did work. I didn’t know I was so technical!!!

    • http://www.viber.com Viber

      Lol, we’re also happy it works now :)

      If you notice, though, these are the exact instructions that we give at the top of this page.

  • Cat

    Hi, I have Viber on my iphone and it doesn’t work in work (University): only shows preview and it rings, but I can’t answer or read the messages.
    It works fine at home tho.
    Is there anything I can do beside contacting network provider (might be tough as it’s a big Univ)?
    Thanks so much.

    • http://www.viber.com Viber

      Unfortunately there is not much else to do rather than contacting them, since Viber’s ports are simply blocked (it’s a technical barrier).

      In the future we might adapt Viber to work also on HTTP ports, in order to try and help our users in universities etc. use Viber, at least for texting.

  • Ratou2003

    got viber on Iphone4 since yesterday i cant send message or call. i unistall and install again. now it ask me to check my network connectivity ….

    i am in china Tianjin with Orange FR provider (so i dont use 3G here crasy price) and to connect internet i use home Wifi. was working fine until the 12 feb. please VIBER help us

    • http://www.viber.com Viber

      Our assumption right now is that the Chinese authorities have decided to block Viber 2 days ago (as they’ve threatened to do for a while now). If that’s the case, then unfortunately there is not much we can do to help :(

      In order to help us understand this problem further, may I please ask that you test Viber on a few different WiFi networks, and also on other 3G networks (by other providers), in order to determine whether or not this is a complete, national block?

      Thank you in advance.

      • http://profile.yahoo.com/GSOSIQ5UE6UA4PCUZH2RVGIMLY The Seeker

        I cannot log in just couple hours ago, I am in Shenzhen, China.
        Holy Molly, I just login my VPN and voila! Viber logging in!…..

        • http://www.viber.com Viber

          Yes, Seems like Viber was completely blocked in China a few days ago :(

          May we ask if Skype works?

      • Patrick Driver8

        I’m in Shenzhen china too. As of this past Sunday (2/12/2012) I am unable to make outgoing Viber calls. I was able to pick up calls – but I made the mistake of uninstalling my Viber and redownloading – now I can’t even register!
        Any way you can reactivate my account remotely so I can at least receive Viber
        Calls? :(

  • Hozefa74

    Hi, I was using viber for last 2 months or more but from today the viber is not working at all. When ever I try to connect to viber it as no internet connectivity or viber cannot connect to the work. I m using ipad2. My iPad software up today and also few days viber software was also updated. I’m in china and my mobile carrier is china mobile. My iapd2 is wifi and 3G enable. I can use email etc on wifi and on my 3G connection but when ever I try to connect to viber it says viber cannot cannot connect to Internet.
    Can anyone please suggest what is the problem?
    Also my wife is using another android phone Sony ericsson Xperia and even she is not able to make the call from viber. Says the same problem. She is using china Unicom mobile carrier with 3G connection and Xperia also have wifi facility.
    If anyone have idea please suggest urgently
    Thanks.
    Huzefa

    • http://www.viber.com Viber

      Seems like the authorities in China have decided to block Viber in the whole country, and that is why you are experiencing this issue. Unfortunately there is not much we can do to help :(
      Try contacting the authorities and ask for the reason for this block.

  • joregelt

    hello
    I am new viber user.
    HTC desire android 2.3.6
    I am able to make and receive calls via 3G and it works well.

    I am able to make and receive calls via wifi BUT I cannot hear any sound.
    The other side of the call can hear me, I cannot hear them, in fact it sounds like the call is still ringing out, when in fact they have answered and can hear me,
    This occurs when I make the call, and also when they make the call and I answer.

    I HAVE opened the ports listed above in the firewall.

    Can you suggest what could be the problem?
    It seems the audio stream is being blocked?

    Daniel

    • http://www.viber.com Viber

      The fact that it works fine on 3G but not on WiFi basically proves that you’re still blocked on your WiFi network. you’ll need to contact your router manufacturer for help, since you said that you’re sure that the ports are forwarded correctly, but one side is still not transmitted.

    • HB

      Problem solved now :)

      • http://www.viber.com Viber

        Good to hear :)
        Enjoy Viber!

  • http://www.facebook.com/dutch2005 Michael Maertzdorf

    Is it going to be possible to get viber to work like skype in the near future? e.g. try the programs own ports and if it fails fallback on port 80?

    • http://www.viber.com Viber

      Working on port 80 (HTTP ports) is something we are considering these days. It’s a little technologically complex, so it might take a little while. Once we have news on that, we will publish it on our Facebook page :)

  • Mahan_m994

    hi..i have iphone 3g..and my iphone updated to last version and my viber updated to last verson..but when i open the viber app,viber tell me ”no connectivity”…my iphone connect to the internet with wifi,,and i surf the web but viber give me this error!my brother with his sumsong galaxyphone can use viber on same wifi network but i cant.. i’m in iran,,plz help me

    • http://www.viber.com Viber

      Hi Mahan,
      We suspect that the Iranian authorities have blocked Viber in most of the country. Please call your cellular company and verify this information with them.

      If that is indeed the case, unfortunately there is not much we can do to help :(

      • Mahdavi Mahan

        I told you that my brother can use!he is in iran too..so whats the problem?I wana know what is viber’s problem with i phone 3G?!how can I solve the problem..help me plz

        • http://www.viber.com Viber

          Is your brother using the same network as you?
          Have you tested Viber on several different WiFi networks in order to determine what is the source of the problem?

          • Mahan

            my brother use viber on my wifi network…yes i try..i think the problem is the iphone notification center!!(maybe)but i turn on the notification service…

          • http://www.viber.com Viber

            Try the following:

            1. Contact Apple support and ask them for their assistance.
            2. After that, if they don’t manage to help you, you may also try and contact our support team at http://bit.ly/ukGVJ0 and elaborate on the problem.

  • Alireza_gheidari

    hi my friends I live in Oman but I unfortunately I cant use Viber software with my cellphone ( Iphone 4S) if some body can solve my problem I am so glad solve it..If some body know it please send Email for me …
    thanks..
    alireza_gheidari@yahoo.com

    • http://www.viber.com Viber

      Hi,

      The authorities in Oman have decided to block Viber in the whole country, and that is why you are experiencing this issue. Unfortunately there is not much we can do to help :(
      Try contacting the authorities and ask for the reason for this block.

      • Scavenger519

        Good news

        You can use Viber in Oman now.
        My Omani friends called me yesterday using Viber app :)

        • http://www.viber.com Viber

          That’s VERY good news!
          Has it been unblocked on all WiFi (ISP’s) and 3G networks?

          Is it fully working for all Viber users in Oman now?

          • Scavenger519

            Yes.
            All Viber users are able to use it in Oman..

            It was unblocked just last week..

          • http://www.viber.com Viber

            Thank you so much for report this back to us, this is indeed happy news and we hope that you can once more enjoy Viber with your friends freely :)

            If anything unfortunately changes, please do let us know again.

            Best regards!

  • JM

    Hey, i live in France and i m on android 4.02 i have a galaxy nexus. so i installed viber on my phone it works on 3G but on wifi i can do nothing not even to import my contacts and when i try to make a call or even import them its says “viber service is curently unavailable or being blocked.please try again”. plz help me with that cause id like to make calls over wifi also its much easier. im with SFR(network carrier)

    • http://www.viber.com Viber

      Hi,

      1. First, please try uninstalling and reinstalling Viber when connected to a few different WiFi networks. Does it work now?
      2. Also, please make sure the following ports are enabled on your routers or firewalls:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, contact your router manufacturer)

      • Alunz

        hello, I was open on our firewall
        1) TCP 5242
        2) TCP 4244
        3) UDP 5243
        4) UDP 9785
        ingoing & outgoing
        But, still can not get connection to viber server.
        Is there have any other port I need to open on firewall?
        Because if I allow all service on firewall, it’s works fine.
        Thanks for your help.

        • http://www.viber.com Viber

          If it’s a firewall that’s blocking Viber, then it may be blocking something else that Viber tries to use (not only ports).

          You may need to contact the Firewall developers for more support on this issue.

  • Pablo Bouyssounade

    The actual port is UDP 7985 and not 9785.
    At least that what my firewall is dropping.
    added to 7985 and problem solved.
    Please not that I left 9785 still as allowed through the firewall. Not sure whether this is required but I’m to lazy to keep testing.
    Basically I have allowed the following ports:
    TCP: 5242 and 4244
    UDP: 5243, 9785 and 7985

    Probably someone from Viber needs to update their documentation.

    • http://www.viber.com Viber

      We will check this issue, but for now no changes were made in the ports that we use, and it should still be 9785.

      Have you tried blocking (or “unallowing”) 9785? Then what happens?

      • http://www.facebook.com/mido.ali3 Mahmood Ali

        VIBER ON 3G GIVE THIS EROR ( an internet connection is required to place free viber calls) BUT IN WIFI WORK GOOD

        WAHT I DO???

        • http://www.viber.com/ Viber

          Some mobile operators across the world block Viber on their 3G network. Usually this happens when users have a “simple” data plan (or a prepaid contract), meaning they didn’t pay extra for using VoIP on their 3G network.

          In order to verify this, we recommend that you contact your cell company and confirm this with them.

          • Matt Parker

            You can use a VPN on your mobile device. I personally use SSLPrivateProxy VPNs and they work like a charm with Viber and any other application.

    • LRC

      Same here! I first opened ports tcp5242, tcp4244, udp5243 and udp9785 and under our wi-fi network one could place a call but got imediately disconected as soon as the other part (also under our wi-fi network) anwsered; then after opening port udp7985 everything is working fine!

      • http://www.viber.com/ Viber

        These are Viber’s ports:

        TCP: 5242 + 4244
        UDP: 5243 + 9785

        Note that it is UDP:9785, and not 7985 as you mentioned.

        • LRC

          Ok! Thats the ports I first opened following the first post I read. But only after opening tcp7985 – as Pablo Bouyssounade refered, 9 months ago – i could call another viber user, both inside our network.

          Anyway: it’s working!

          LRC

          • http://www.viber.com/ Viber

            Thanks for sharing. We’ll take a closer look at it.

            Best regards, and keep enjoying Viber :)

          • JOsdfgsdfg

            Hi there,

            We experienced exactly the same problem as mentioned. Calls made are immediately dropped on answering the call.

            Thought we’d try adding UDP port 7985 as suggested in this thread and voila it now works!

            One of your programmers has gotta have a typo in their code!

  • Arthurkoo

    i have a valid wifi connection in Ho Chi Minh, how come i can’t dial out. The display message is – An internet connection is required to place free Viber calls. Check your connection and try again. Place a regular call instead?

    • http://www.viber.com Viber

      It could be that the network you are connected to is blocking Viber’s traffic.

      1. First, please try uninstalling and reinstalling Viber when connecting to a few different WiFi networks (in order to pinpoint the source of the problem). What are the results?
      2. Also, please make sure the following ports are enabled on your routers or firewalls:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, you may contact your router manufacturer)

  • Mariteslyabut

    Hi! I’m base in Oman. I’m new viber user just a month ago. I’m using Samsung galaxy ACE GT-S5830i android 2.3.6 but whenever I tried to call my family in the philippines using viber apps I can hear them but they can’t hear me, then I tried to used my husband cellphone Samsung Galaxy Y using viber apps it works but sometimes we encounter same problem. what is the reason? i hope you can help me. thak you

    • http://www.viber.com Viber

      It could be that the network you are connected to is blocking Viber’s traffic.

      1. First, please try uninstalling and reinstalling Viber when connecting to a few different WiFi networks (in order to pinpoint the source of the problem). What are the results?
      2. Also, please make sure the following ports are enabled on your routers or firewalls:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, you may contact your router manufacturer)

      * If the problem persists even after checking all of the above, please let me know and I will direct you to get further assistance :)

  • Khairul

    Hi, I’ve a WiFi network and can browse from my android using a proxy settings.
    And also can login to Skype but, unable to login to viber. Please note that all the ports mentioned here are open. Can any one help me regarding this problem?

    • http://www.viber.com Viber

      Hi,

      What country are you located in?

      Also, does this problem occur *only* on this one WiFi network, or also on all other WiFi networks you tried Viber in?

      • Khairul

        its not connecting while need to login through a proxy. without proxy its not an issue.

        • http://www.viber.com Viber

          We’re still not sure we fully understand…

          Viber doesn’t work specifically when you’re connected to a Proxy?
          When you’re using regular WiFi (without any proxy) it works just fine?

          • Khairul

            Yes, You correctly got my problem.

          • http://www.viber.com Viber

            Well,

            When connecting through proxy, you are subject to the Proxy’s settings (they could even be virtually unknown to you, since you are connecting to the internet through a 3rd-party).

            It could be that that proxy is blocking Viber’s traffic/ports, or VoIP protocols in general. In order to solve this problem, you’ll need to contact the proxy server administrators and see if they can help you sort this problem out.

            Give them the info that’s posted in this article, above.

          • Ayman

            Dear Sir,
            is there any chance to develop Viber so that it may work on any port i specify ?!
            since it’s blocked in UAE and the only way to use it is by using a VPN connection, i really want to make ISP suffer and i think you can make that happen if you add more most used ports.
            Thanks in advance

          • http://www.viber.com Viber

            Hi,

            We are not even sure that in the UAE Viber is blocked by port (it may be the case, but it might also no be the case).

            At this stage we unfortunately don’t plan to add the option of changing Viber’s port. In the future we might provide this option.

            Meanwhile, we invite you to enter our Feature Request page and post your suggestion there, or join an existing similar suggestion. The more people join on a request, the faster it will become reality :)

            You can find it here: http://helpme.viber.com/index.php/Knowledgebase/Article/View/43/9/have-an-idea-for-a-new-feature

          • Ayman

            Dear Sir,
            i think its blocked by port since some other voip softwares work like charm, the unknown ones of course and not for long, UAE uses a proxy server that passes few websites from being blocked so its manually added for sure and not websense.

            thanks for your suggestion and i will post there for sure and even ask all uae people to do so :)

          • George

            Hi, I just moved to UK and I uninstalled viber and reinstalled it using my new UK number. it works fine while connected to wifi but as soon as I switch to wireless network (T-mobile) it stops working. no outgoing or incoming messages or calls. I tried reinstalling it several times but nothing changes. please help

          • ScottR

            I am having the exact same issue on an HTC desire! Please help someone!

  • Guest

    If the WiFi network encryption type should be WEP and not WPA1, WPA2

  • kouros

    hi..i’m from iran,and i have problem with viber since 2 days ago.
    When sending a message, the message is like sending..state and does not send.please help me..and what’s the problem?

    • http://www.viber.com/ Viber

      Hi,

      Viber system is currently experiencing connectivity issues. This is related to our hosting provider (Amazon) that is having a major problem that also affects many other services worldwide.

      Amazon is on it, and we hope that with their help we’ll be able to restore Viber’s service soon.

      We apologize for the temporary inconvenience.

    • Amir

      Hi same here. I am from iran i have iphone 4 and 4s both in ios 6.1, iphone 4 does not coonet to viber but 4s connect and work normal. When i call from 4s to 4 it call and i can talk but when i try to call 4s from 4 it does not connect. Both iphones are in same wifi , i reinstall viber on iphone 4 , reset network, restart idevice and all this things dont fix the problem,
      Viber plz tell me why i have this problem?

      • http://www.viber.com/ Viber

        We are suspecting that the authorities in Iran have decided to block Viber in the whole country, and that is why you are experiencing this issue. Unfortunately there is not much we can do to help :(

        You may try contacting the authorities and ask for the reason for this block.

        * The fact that some devices can still use Viber normally suggests that the block might be gradual. We are still trying to understand ourselves the technical properties of this block.

        • Amir

          thank you for your reply
          please notice that since 2 days ago my all devices via andoid and IOS connect Normally to Viber
          i check with some friend they have normal service from viber too
          so i could state that in this moment viber working well in iran( for me and my frnds)

          • http://www.viber.com/ Viber

            Interesting news.

            Viber works again on all WiFi and 3G (cellular) networks?

          • Amir

            yes it does, i have 120 viber contact list and they do well connected to viber, as i wrote before yes it works now,

          • http://www.viber.com/ Viber

            Thank you for sharing this exciting news. We are glad all is working again, and we hope it stays this way ;)

            Please let us know if the problems start again.

            Meanwhile – enjoy Viber! :)

        • JohnSmith

          You can always use a VPN on your mobile device. With the VPN, your provider can’t block viber or other services anymore.
          SSLPrivateProxy provide a comprehensive suite of high anonymous proxies and secure Virtual Private Networks.

  • moein

    hi i am from iran

    when i try to call or send sms with viber i have message that says viber service is currently unavailable or being blocked

    what is the problem? please help

    • http://www.viber.com/ Viber

      Hi,

      We are suspeting that the authorities in Iran have decided to block Viber in the whole country, and that is why you are experiencing this issue. Unfortunately there is not much we can do to help :(
      You may try contacting the authorities and ask for the reason for this block.

  • Al1000

    I have HTC desire HD. I cant make outgoing calls on viper but can receive incoming calls when I’m using home wifi. My wife is using HTC and can make outgoing and incoming calls. Any thoughts?

    • http://www.viber.com/ Viber

      Hi,

      What country are you located in? Which cellular network?
      Have you tried testing Viber on a few different WiFi networks?

  • Elmira

    Hi..im from iran…i have iphone 4s … My viber doesnt work since 2days ago..i uninstalled it and installed again…still doesnt work…but my sister uses same network can use viber… Whats the problem?

    • http://www.viber.com/ Viber

      We suspect that the authorities in Iran have decided to block Viber in the whole country, and that is why you are experiencing this issue. Unfortunately there is not much we can do to help :(
      You may try contacting the authorities and ask for the reason for this block.

  • parham

    hi, i live in iran and i use andriod on htc , my internet access is on but i cant use viber and i have been seeing the “server disconnected ” error from yesterday. what can i do to access again. tnx

    • http://www.viber.com/ Viber

      We are suspecting that the authorities in Iran have decided to block Viber in the whole country, and that is why you are experiencing this issue. Unfortunately there is not much we can do to help :(
      You may try contacting the authorities and ask for the reason for this block.

  • Lara

    Is there a way to increase the size of the font in the Viber application? I don’t want to increase the font on all of my applications, just Viber.

  • tplinked

    i have tplink TL-WR841N, there are two functions under port forwarding, one is virtual server and another is port triggering, my question is:

    where do i input the UDP and TCP ports, any help would be appreciated thanks, i would like to add that i do not have a static ip address since it is a shared internet line from my isp

    • http://www.viber.com/ Viber

      You may find help with this question in TP-link forums, or other technical forums.

  • wykie

    Hello,
    I am using viber on my galaxy note2 on wifi networks no issues to sending or recieving calls and messages but when i am using data from my operator which is vodafone spain i cant even send or recieve calls not even messages. Can u plz tell what can be wrong? Thanks in advance

    • http://www.viber.com/ Viber

      Some mobile operators across the world block Viber on their 3G network. Usually this happens when users have a “simple” data plan (or a prepaid contract), meaning they didn’t pay extra for using VoIP on their 3G network.

      In order to verify this, we recommend to contact your cell company and confirm this with them.

  • Khaled Hamadmad

    Hello,I am using Viber on my Windows desktop and when I connect to some public WiFi in the street, Viber stops working. I know they disable the ports, but how can I change the ports on my PC .. I think it’s possible unlike the phone app.. any help plz

    • http://www.viber.com/ Viber

      @Khaled Hamadmad -

      Unfortunately Viber’s ports are fixed at this stage. We will consider adding the option to change the ports in future versions.

      These are Viber’s ports:
      TCP: 5242 and 4244
      UDP: 5243 and 9785

      • YK

        Hi, our company’s wifi network is behind a proxy server. By allowing the mentioned TCP & UDP ports in the router we are able to make & receive call and message; however, we cannot send any picture message out (receiving picture message is okay), any idea how to solve this?

        • http://www.viber.com/ Viber

          Hi,

          This is something you’ll need to check with the IT department at your company. Unfortunately we (Viber) cannot assist further here :(

  • Saad

    i’m receiving late notifications….

    • http://www.viber.com/ Viber

      Hi,
      what device do you have? Which version of operating system?

      Did you test this issue on a few different WiFi networks?

  • merlin

    hi im from Iran, i have htc wildfires android 2.3, and WiFi, used Viber without any problem, 2weeks ago i uninstalled and reinstalled the viber and it did not work anymore i did not receive any code and when i typed ex code that did not work any more i red your forum i waited 24hours and install it again but nothing happened and i open ports on my router, i try with another number it doesn’t work any more can u help pleas?

    • http://www.viber.com/ Viber

      Please try removing Viber, wait 24 hours, reinstall and try again (make sure you try both the SMS and the automated call options).

      In addition, you may try to register to Viber with a different number (for example – your home landline number, a friend’s number, etc.), in order to determine whether the problem is specific with your number, or a general one.

      * If it still fails, it might be that Viber is blocked in your ISP / your cellular company in Iran :(

  • shahid

    hi i am working in saudi arabia since 05/06/2013 viber blocked here is there anyway to unblock it???

    • http://www.viber.com/ Viber

      Hi Shahid,

      We are currently looking into this problem, and trying to find a solution.
      When we have more news, we’ll let you know.

      • Richard

        Hi, we have a problem on wifi. All ports are enabled including the required ones on Viber. On iphone: Push notifications appear – with new viber messages. But when we open viber – there are no new messages visible. Also we can not send messages from this wifi network.
        (We tried several devices, none was working with viber here, but all of these devices were working smoothly when connected to another internet connection)
        So there must be something wrong in our wifi – internet access here while Skype and most other voips are working smoothly.

        It’s unfortunately a complex network so not as easy as replacing a router etc. Its a corporate ntw of a small company where we – system administrators – can not solve this problem for our users.
        We ran out ot ideas of what else to check (since all ports were opened.) and only viber is not working for the users so far.
        Kindly let us know if you have ever heard of issues with similar cases.

        • http://www.viber.com/ Viber

          Hi,

          What country are you located in?

          If you are behind a complex corporate network, have you made sure that that those ports are enabled in all of the routers “along the way”? (in the chain of routers that your traffic goes through)

          Unfortunately there is not much we can do to help here, since it sounds like this problem is caused by the network itself (as you said). It is recommended to contact you network admins and see if they can analyze the problem and see where in the network this block occurs.

          • karthik

            i cant use viber with WIFI…it asks for mobile data…why?

          • http://www.viber.com/ Viber

            It could be that the network you are connected to is blocking Viber’s traffic.

            1. First, please try uninstalling and reinstalling Viber when connecting to a few different WiFi networks (in order to pinpoint the source of the problem). What are the results?
            2. Also, please make sure the following ports are enabled (“forwarded”) on your routers or firewalls:
            TCP: 5242 + 4244
            UDP: 5243 + 9785

            (if you are not sure how to enable ports, you may contact your router manufacturer or your Internet Service Provider)

            * If it still fails, please specify what country you’re located in, and which cellular network you’re subscribed to.

  • wilmark johnatty

    This is the Achilles heel of viber. Viber will not work on several wifi networks. I dont understand how Viber can think that port forwarding is the solution. We dont have access to router admin on any public system. THey are telling you to contact the router manufacturer to settup their program, OR have your corporate network admins find where the problem… FAIL. Supposed there are other users who want to use vibber will their data be forwarded to my IP – hey Viber FIX you bloody software. In the mean time there is a very easy solution – dont depend on viber working on anything other than your own personal network.

    • http://www.viber.com/ Viber

      Hi Wilmark,

      It could be that the network you are connected to is blocking Viber’s traffic.

      1. First, please try uninstalling and reinstalling Viber when connecting to a few different WiFi networks (in order to pinpoint the source of the problem). What are the results?
      2. Also, please make sure the following ports are enabled (“forwarded”) on your routers or firewalls:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, you may contact your router manufacturer or your Internet Service Provider)

      * If it still fails, please specify what country you’re located in, and which cellular network you’re subscribed to.

      • shadab

        I am in France and my WIFI provider is SCICAR, viber is not working constantly here.

        • http://www.viber.com/ Viber

          Please see our response above regarding Viber’s ports.

      • pleasehelp

        Hi. I am in Japan and have a Docomo subscribed iphone. I would like to use viber on the wifi from my mobile router with Rakuten superwifi (model GL04P)(emobile network).

        • http://www.viber.com/ Viber

          As we said in the above message, there shouldn’t be any problem doing that, as long as that WiFi network doesn’t block Viber’s ports.

    • Felenskool

      wilmark, the tone in your message is uncalled for. Viber is not responsible for the restrictions set forth on everyone’s wireless network. Since it uses TCP/UDP ports for communication (as any other network application would), firewalls and routers can block this type of communication.
      If you’re not able to use it over wifi, use it over cellular. Again, it’s not Viber’s responsibility to provide access to you over restricted wireless networks.
      To Viber: Thank you for providing us with FREE VoIP!

  • Marko

    Hello,

    I’m administering a small community network and I’d like to give access to Viber to network users. We’ve setup quite a restrictive firewall because of abuse of our network, so I can’t simply open up those ports for entire internet. What IP range does Viber use? I’d like to open up those ports only for Viber’s IP addresses, so I don’t end up compromising network’s security. Thank you!

  • Marko

    Hi,

    I thought that I have asked this question last night, but it seems to have disappeared…

    Anyway, I am an administrator of a small communitiy wifi network. Our firewall is set up very restrictive because of previous abuse from our users. I’d like to enable access to Viber from the network, but I don’t like idea of opening up these ports for the whole Internet. Can I please have an IP range that Viber uses for communication, so I can open those ports only for that IP range?

    Thank you!

    • http://www.viber.com/ Viber

      Hi Marko,

      Viber communicates directly with our server using specific domains. However, it always uses the ports mentioned in the article (this is fixed).

      If you’d like to get more info about those domains in order to enable Viber communication in your network, please contact our support team at: http://helpme.viber.com/index.php?/Tickets/Submit/RenderForm/13

  • kajol

    hi,
    i’m facing continues call drop problem in my office network.
    here my network scenario,
    IPS drop firewall > Public IP to Private IP NAT > connected to mikrotik router > here again Private IP to Private NAT > connected to distribution Switch > Access switch and then user.

    when i used from directly firewall with public IP… viber works fine….. but from user end continues call dropped, can’t make a singe call !!!

    would you please me ?? whats the problem ??
    In my network, NAT occurred two times (1st in firewall, 2nd in Mikrotik router)….

    • kajol

      Note: all ports are open in all devices

      • http://www.viber.com/ Viber

        Hi Kajol,

        There are other ways to block/disrupt Viber’s traffic, other than ports.
        Have you tried contacting your network admin or ISP for more information about this problem?

        Have you tried other networks/service providers, in order to determine if that’s the reason for the problem?

    • http://www.viber.com/ Viber

      Hi,

      What device are you using?

  • Andrea DeRocco

    Hi-
    I downloaded Viber in the United states using the wifi there. I am currently in France and uninstalled viber from my Blackberry. I tried reinstalling Viber to my blackberry using the Wifi here in France, however a message “There was a problem. Please try again”, keeps popping up. My USA number is suspended, however I do have a french phone number for while I am abroad. Is there another way in which I can download viber without having problems? Of should I try using another wifi source? Thanks in advance.

    • http://www.viber.com/ Viber

      Hi,

      Have you tried installing Viber when connecting to a few different WiFi networks?
      This could be a problem with the specific WiFi network you are trying to use.

      • Andrea DeRocco

        I tried downloading from a different wifi source. the network type of the one i tried the second time is 802.11 b/g. I dont know if that helps. Moreover; I recieved a message saying “BBID token is expired (Error ID: 40631) when trying to reinstall viber. I dont know if that helps to calify things. Thanks again in advance.

        • http://www.viber.com/ Viber

          Thank you for the details.

          We would appreciate if you could take a minute and report the details to our support team using this direct link: http://helpme.viber.com/index.php?/Tickets/Submit/RenderForm/1

          When you submit the ticket, in the line called: “Through which channel did you submit your initial inquiry”, please make sure to choose “Technical Forum”. With this information, our development team will hopefully be able to find the source of the problem, and ultimately resolve it.

          Thanks in advance :)

  • nikita

    halo i am in deutschland und i have windous 8 phone but the viber dont accept my number :(

    • http://www.viber.com/ Viber

      Hi,

      Are you getting any specific error message?
      Do you have the latest version of Viber installed on your mobile phone?

      • nikita

        no, nothing speacial, onlly my number ist not correct but ist correct. now after i read your answer ( thnx) i unistall the old one but i can not install the new one :( it is say in that is not for my phone..Windows 8 HTC. i have 2 days with this i am going tired. Help me

  • mar

    how come i got charged for calls on viber out to the philippines? you advertise it free but my credit was used.

    • http://www.viber.com/ Viber

      Hi,

      Thank you for this information.

      Please report this issue to our team, and they will look into it immediately.
      Here is the direct link: http://helpme.viber.com/index.php?/Tickets/Submit/RenderForm/1
      When you submit the ticket, in the line called: “Through which channel did you submit your initial inquiry”, please make sure to choose “Technical Forum”.

      Thank you, and we apologize for any inconvenience caused.

  • mostafa

    i’m trying to use viber desktop on my ubuntu, neither native version nor through wine could connect to internet!
    whereas it’s windows version in my dual boot laptop is working just fine in the same network!
    i also enabled port forwarding in my modem, but no success!

    • http://www.viber.com/ Viber

      Hi,

      It could be that the network you are connected to is blocking Viber’s traffic.

      1.
      First, please try uninstalling and reinstalling Viber when connecting
      to a few different WiFi networks (in order to pinpoint the source of the
      problem). What are the results?
      2. Also, please make sure the following ports are enabled (“forwarded”) on your routers or firewalls:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, you may contact your router manufacturer or your Internet Service Provider)

      * If it still fails, please specify what country you’re located in, and which cellular network you’re subscribed to.

  • hamid

    there seems to be a problem connecting to viber’s service please check your connection and try again.(iphone 5s)

    • http://www.viber.com/ Viber

      It could be that the network you are connected to is blocking Viber’s traffic.

      1.
      First, please try testing Viber when connecting to a few different WiFi networks, in order to pinpoint the source of the
      problem). What are the results?
      2. Also, please make sure the following ports are enabled (“forwarded”) on your routers or firewalls:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, you may contact your router manufacturer or your Internet Service Provider)

      * If it still fails, please specify what country you’re located in, and which cellular network you’re subscribed to.

  • Atoosa

    I unistalled my last viber and reinstalled new version of viber,But i have problem with that setup,I inserted my phone number and contry code,when i press continue give me an msg that there seems to be a problem with connecting to viber service! My iphone is 5 and my conuntry is Iran!

    • http://www.viber.com/ Viber

      It could be that the network you are connected to is blocking Viber’s traffic.

      1.
      First, please try uninstalling and reinstalling Viber when connecting
      to a few different WiFi networks (in order to pinpoint the source of the
      problem). What are the results?
      2. Also, please make sure the following ports are enabled (“forwarded”) on your routers or firewalls:
      TCP: 5242 + 4244
      UDP: 5243 + 9785

      (if you are not sure how to enable ports, you may contact your router manufacturer or your Internet Service Provider)

      * If it still fails, then it could be that the authorities in Iran have blocked Viber in your region.
      If this is the case, then unfortunately there is not much we can do to help :(

      • Asadul Huq

        Here in our school internet provider has stopped all most all ports other than 80. Now he says that he will open the viber ports if ip is provided to him. He says he is agreed to open the port only for viber traffic so he needs viber ip or so. How would I know the viber ip to give it to my internet provider? Thanks.

      • Igor Pomaranskiy

        Is it REALLY impossible to make Viber able to use only TCP 443 port?..

  • Yuriy Shevchenko

    Are there any changes in Ports?
    If it works month ago, why my provider need to block these ports now? I don’t think that it possibe.
    In this month there are 3 wi-fi points doesn’t work with viber (Home in Ukrane, hotel in UAE, central cafe in Kiev). I still believe that it were changes on the Viber side, aren’t they? Thank you for answer.

  • Petra

    Hi, I would like to know if it is possible to connect to Viber trough my Nokia 500, and simultaneously connect to WiFi using my laptop’s network adapter.
    To make this clear, Viber app should use Nokia 500 connection, and everything else my Wifi network. Is there any tutorial?
    Thanks

  • Asadul Huq

    Here in our school internet provider has stopped all most all ports other than 80. Now he says that he will open the viber ports if ip is provided to him. He says he is agreed to open the port only for viber traffic so he needs viber ip or so. How would I know the viber ip to give it to my internet provider? Thanks.

  • Niko

    I can’t use viber on specific wifi. I have the “disconnected” message. Other users can. When I connect to that network, viber uses high ports 54xxx. Can I somehow configure my phone to use viber specified ports? (phone is prestigio 5044).
    p.s.
    Viber works fine on other wifi networks

  • Ernest0

    Hello. I am using Viber on my iphone 4 ios7.0.4. I am connected to a university wifi network, credentials needed, it uses a proxy server without athentication (proxy.xxx.xxx.xx:3128) . I have realised so far that Viber text messages are working fine (didn’t try viber calls yet) in this wifi network. That impressed me, because other similar text messaging apps are not working behind this proxy. How is it possible that Viber takes iphone proxy configuration into account and other apps don’t? Is that the cause? Just curious.
    P.S: I can make all those other apps work in android behind this proxy on a rooted phone using an app to set global proxy settings for all apps in the phone.

  • Allen

    I’m using a tomato fw router and configured the ports both port forwarded and under my QOS rules. the problem is if someone contacted me via wifi we get frequent reconnection and garbled audio and most of the time no audio. BUT if someone calls me via 3g/4g there’s no problem at all. Anyone experiencing this problem?

  • arefin nowshad

    Hey, I am in USA using the AT&T U verse internet . I am trying to install viber in my samsung tablet, When i want to register my number it says that , “Could not connect, An internet connection is required to set up viber. Check your connection and try again. ” Previously I have been using viber with TWC and I had no problem with that. Can you please help ? Thanks

    • http://www.viber.com/ Viber

      Hi, We will need some more information in order to help you resolve this issue. Please fill out a support ticket here: http://bit.ly/1aOwGy2

      A support agent will be in touch with you shortly.

      Thanks!

  • neo

    I work in an environment where cellular reception is minimal and I would love to use viber for communicating. Unfortunately udp/some ports are blocked in the wifi and of course asking them to unblock it for viber is not an option! Is there an alternative method to use viber or shall I stop trying and settle with other options such as skype/whatsapp/telegram to communicate with friends and family?

    • http://www.viber.com/ Viber

      Hi there,

      Unfortunately, if you are unable to access your 3G/4G network and your Wifi ports are blocked, there is no other alternative. Viber requires a strong, stable connection. If you cannot unblock the ports, the connection will most likely not be strong enough for Viber to fully function.

      • neo

        Will Viber work on port 80 (HTTP ports) in the future? This question has been going on since 2011! At least for text this should be allowed!!!

  • rytz70

    Why don’t you set Viber available to all ports?

    • http://www.viber.com/ Viber

      Hi,

      For security reasons, Viber is not available on all ports. We value our users’ privacy and attempt to make our network as secure as possible.

  • Desperate

    My Viber was working fine till today since installation. It connected to my Wifi with no problems. But from a few hours I can’t seem to connect Viber to my Wifi. I can use my wifi connection on other apps, and use internet without problems. But Viber doesnt seem to connect. Please help!!

    • Spoofffed

      Think they are having issues, My service has gone out and came back twice today. This isn’t normal. Just sit tight and it will be usable.

  • mw

    Viber suddenky stopped working today on iphone tabket and blackberryphone all are different networks Iis there a probkem

    • http://www.viber.com/ Viber

      Hi,

      Please make sure that you have the latest version of Viber on your mobile device. If that version is not updated, you might experience issues with Viber on your other devices.

  • Masum Billah

    in my iphone 4 mobile i am facing a problem. when i am closing my apps i am not getting any calls. when i am opening the apps then i am getting calls, sms and miscalls. I am connected with wifi. in this same connection others users are getting calls when they are closing the app. what is my problem? i have uninstalled the app and again i have installed it. but problem remains same. Anyone is not getting me!!!! Please reply as soon as possible.

    • http://www.viber.com/ Viber

      Hi Masum,

      Exiting Viber can cause you to disconnect from the Viber servers, thus limiting your availability. That is why you receive a warning before you exit the application.

      • Masum Billah

        I tried to do so….but it nothing happened… today i can’t call anyone… its exiting the app when i am going to call anyone from viber.

        • http://www.viber.com/ Viber

          We would like to investigate further. Please contact our support team here: http://bit.ly/1aOwGy2

        • JJ

          SAME HERE…HELP…

  • Shawn

    When I go to my comcast advanced setup for TCP/UDP it has a start and end port. where do I plug in the numbers you gave me above? what number goes into start and what number goes to end?

    • http://www.viber.com/ Viber

      Hi Shawn,

      For full instructions on how to open the ports, please open a support ticket here: http://bit.ly/1aOwGy2

  • Bijay

    Helo sir, I am from India. In my university, differernt proxies are there. My OS is Windows 8.1. I installed viber from its market. when my phone’s packet data is off, then it shows some miss calls and some message not the whole conversation and i cant compose message and send through it. I changed my UDP port to your port number as mentioned above. Then also the problem is same.

    • http://www.viber.com/ Viber

      Please contact a support agent by filling out a support ticket here: http://bit.ly/1aOwGy2

  • Mig

    Hello everybody.. i am quite desperately trying to keep my Viber Desktop connection working while connected to a VPN but it won’t connect and goes offline the moment the connection is active. I have opened the ports (ingoing and outgoing) on the firewall but am not sure whether this has an affect if the VPN Tunnel has been started. I have searched the Internet and have as of yet not been able to find a similar post so am hoping somebody has a hint or can give me some advice. Its working fine on the Desktop if i haven’t got the VPN Tunnel (work related) open but as soon as i start the VPN connection my Viber Desktop goes offline. Thanks your your help.

    • Mig

      just to add.. this is a Windows Vista PC and location is Germany

      • http://www.viber.com/ Viber

        Hi Mig,

        We would like to help! Please open a support ticket here: http://bit.ly/1aOwGy2 and a support agent will be in touch with you shortly.

        • Lis

          I have the same trouble with my laptop its germany aswell and Windows 8.1.. any help?

          • http://www.viber.com/ Viber

            Please make sure that you have the following ports open:

            TCP: 5242 and 4244
            UDP: 5243 and 9785

            For instructions on how to do so, please read here: http://bit.ly/1nVQdsv

            Should you continue experiencing an issue, please open a support ticket at this link: http://bit.ly/1aOwGy2

        • Mig

          Thanks a lot. I will open the ticket as advised by you.

  • Doni

    Hello, Since 2 Weeks now i’ve had the same problem i really need to get this fixed ive contacted VIber Support also but they dident they weren that helpfull linked me some sites to go to was a dead end.

    so if someone have had theese issue please be kind and help me. what i did before i got this i formated my Tablet and when i tried to install Viber these error message came up when trying to dial my number.. i have uploaded a foto you can se the the issue..

    The things i have tried.
    1, Unistalling/Installing
    2, Trying diffrent Number
    3, Switching IP-Adress/ Other Internet
    4. Formating my Tablet 10 times still.
    5, Removing Cache/Viber Cache.
    6, Switching Playstore account adress.

    What i might think is maybe Viber has blocked my Device ID and wont let me use Viber i dont know..

    nothing have worked still get this error so please anybody if you had these error before please let me know.

    Thank you.

    • http://www.viber.com/ Viber

      Hi there!

      According to our records, it looks as though you were able to activate Viber on your tablet.

      If you continue experiencing an issue, please reply to your support agent and let him know.

      • Doni

        Thanks for replaying. It’s gone three weeks now ive still got the same issue ive tried diffrent Viber version but still the same..i get the error tex.

        • http://www.viber.com/ Viber

          Please reply to your support agent and let him know that you are still experiencing an issue.

          • Amit Singh

            Hi,
            I am using BB 9900, having 3G connection, but i am not able to calls on viber getting errro “there seem to be a problem connecting to viber’s service. please check your connection and try again”
            i have already check APN and other normal things

          • http://www.viber.com/ Viber

            Hey Amit,

            We will need more information from you. Please open a support ticket here: http://bit.ly/1aOwGy2

            Be sure to include the following information:
            - Do you experience this issue when connected to Wi-Fi?
            - Your 3G service provider

  • shady

    I want to present a proposal
    Most of the problems we face in the use of this wonderful program is an activation code
    Process and prevent the program by governments
    So why not open a channel of communication support team directly for these difficulties occur in such a program, for example, kik
    This will be more useful to solve all their problems
    Thank you

  • Fadi

    Hi Viber, I can’t run viber! This msg keeps on popping on screen ” could not be located in dynamic link library… Entry not found” I just can’t get it working on my PC.!?!?!?

    • http://www.viber.com/ Viber

      Hi,

      We will need more information to assist you. Please open a support ticket here: http://bit.ly/1aOwGy2 and attach a screenshot of the error message that you are receiving.

      Thanks!

  • sahil

    does viber desktop work n LAN connection?

    • http://www.viber.com/ Viber

      Hi Sahil,

      Viber for Desktop is supported on LAN connection. If you are experiencing issues, please check that your connection is strong and stable.

  • Naya

    Hi viber, I live in morocco and it seems that viber is not working with wi fi all over the country, have already tried to open the ports but still no result! is there anything to do about it?