ServiceBus Notifications UpdateRegistarionAsync 502 - Web server received an invalid response while acting as a gateway or proxy server.

When trying to register or update (any android/ios/wp/windows) registrations, we are most of a time getting error

502 - Web server received an invalid response while acting as a gateway or proxy server.

case ClientType.android:                        
{                            
registration = await client.CreateGcmNativeRegistrationAsync(channel, cctags); 
break;                        
}  

case ClientType.android:
{                            
var reg = registrationDescription as GcmRegistrationDescription;
reg.GcmRegistrationId = channel;
registration = await client.UpdateRegistrationAsync(reg);
break;                        
}

That happens on Azure server 90% of time. On localhost everything works perfectly.