Not working for google apps

[saaam000]

I don't know why some apps like google apps and instagram app do not work while the device is connected to this vpn ? I thought it was a problem with UDP connections as I asked in #4 but sounds like some apps are detecting this proxy and don't allow the user to connect to it, I should mention that the proxy server I'm testing is fine and I have tested it with some other apps like tun2tap (which I think uses badvpn) and it works fine , any ideas why this happens ?