Currently Being ModeratedJan 3, 2013 2:51 AM (in response to WineMV)
This is a member of the Viber R&D Team
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)
If you have any additional questions, please feel free to contact us.