Problem with Viber 6 installation

Hello everybody,
I am trying to install Viber 6 on Debian Jessie. I downloaded and installed the .deb . I also installed qt5-std package (dependency was not solved by the installer). Now, I can launch the GUI, but I have an error message saying no internet connection. I tried to fix this by installing some certificate - following a solution I found on a forum without success :disappointed:(http://superuser.com/questions/1041013/ … connection )
If anyone can help it would be really much appreciated.
Thank you in advance.