Open the following ports on your router to the machine you'll be playing UT3 on.
13000 is for debug logging I believe and not needed externally.
77xx is typically 7777 unless someone hosts a different port (whatever you host is all you need)
6500 is needed by gamespy
3783 is needed by gamespy
Then host a campaign and have someone try to join. Let's get some feedback in here with people's results by doing this. I got it to work with JD once, but I have a bunch of ports being forwarded that I shouldn't need.
13000 is for debug logging I believe and not needed externally.
77xx is typically 7777 unless someone hosts a different port (whatever you host is all you need)
6500 is needed by gamespy
3783 is needed by gamespy
Then host a campaign and have someone try to join. Let's get some feedback in here with people's results by doing this. I got it to work with JD once, but I have a bunch of ports being forwarded that I shouldn't need.