Spring RTS Engine

We were trying to play a game with my friends, 3 could connect to host but I and a buddy of mine couldn't. I opened both TCP and UDP ports.
Just cannot connect, drops after 45 seconds.

I have this problem currently. I have ports forwarded properly and firewall disabled. I have avast, but I tried connecting to server with it off, no luck. PortChecker shows that the ports are open.

What is the problem here?