Me and my brother and his friend have been trying to play over the internet. I start a server and when they are going to joing me its just says PINGING. They can see me for a while in the serverlist but after a while i disapear from it.
Does anyone know whats wrong?

*laughs at you* You didn't read THE STICKY! http://www.jazz2online.com/jcf/showthread.php?t=9102

i have done that.. it doesnt workk. when I installed port magic did it work.. for 30 secs. then was all the players kicked out, except the one who made the server.

By reading everything in the thread, you will have enough information to find out what is wrong and how to fix it on your own.