unable to connect to rynga via proxy server

[jawad frem]

Hi, I have GT i9500, I am trying to connect to rynga via proxy server that is not blocking access. I use proxydroid app in order to connect all the apps to the proxy server, my friend have GS4 GTi9500 too and connect normaly, he uses proxydroid and same authentication and settings. I am thinking that if I can maybe change my kernel version or baseband version or build number could solve the problem
For more details the proxy server I am connecting to it is at school and the rynga is a voip app, it is displaying ssl connection error. It isn't even connecting not only cannot login, the app does not have any problem and work perfectly on other connections