I think your router has to support NAT loopback or something like that if you want to connect your two game sessions via IP. Just enter an empty string in the session_connect IP argument to test it locally as a LAN game and enable the IP input for other clients to connect to your server over the internet.
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual
