Our games use 22 and 5000-5100 TCP port numbers to communicate with our servers. Check your firewall and configure that in that way that such communication will be possible.

If the default ports are not available, our games will try to use so called 'emergency ports' if possible, those are the commonly used ports (21,22,23,81,443,1080,3128,8080) and thus should not be blocked, but it is not always the case, so the connection using emergency ports can fail as well.