JK2 and JA use different ports.
For JA: Open 29060-29099 UDP & TCP (supposedly you don't need all of those, but for me, I had to open all those for my router to allow me to host & play properly)
For JK2: Like above, but use ports 28060-28099
Most of the time the games will use 29070 and 28070 respectively, but that's not set in stone, as anyone can set a new port to use, so you'll be shut out of those games.
Also open your "DMZ" on your router for your internal IP (such as 192.168.0.2).
If you use software firewalls, set them to give full access (allow all) to JAmp.exe and JAmpded.exe (JA. for JK2, see the equivalent exe files). If you use ZoneAlarmPro and don't know much about it, turning it off may simply be the best solution while you are hosting or playing.
PS: If none of the above works you may need to "update the firmware" or drivers for your router. This is a somewhat techincal procedure, so contact your ISP tech support for the proper procedure or consult the manual(s) for your equipment. Then set the ports again as in the above.
Last edited by Kurgan; 07-17-2004 at 03:53 PM.