You probably don't have your DSL/Cable Router Configured Properly that would cause problems connecting to it.. you should come on the MIRC server irc.holonet.org room #jk to talk to some people maybe they can better help you config it.. all I can tell you is these are the ports you need open on your router to run JK:
and TCP 47624
Also check out this URL for further help,, find your Router from the list..
and just follow the instructions:http://www.portforward.com/english/rout ... rindex.htm
find your router.. follow the instructions select any game it doesnt amtter cause JK has specific port settings to Open.. don't listen to the ports they give u for JK / outcast cause those aint right... Make your you config a static IP beforehand.. they have the tutorial on how to do that on that page..