I have UT2004, same copy installed on his computer too. I just don't know how I can play with my brother who is on an another network. He is about 15 meters away, we both have different routers connecting to different ISPs. I'm a complete beginner is network play.
How? The kicking is done by the server, and in this case the client and server are using the same key. It's like the server was to kick itself. The master server could do that, but there is no master server on LAN.