Things that interfere with portforwarding

[master sven]

Im am still trying to get my jj2 working online properly. I managed to find out that UpNp interferes with portforwarding. Does anyone know if there are other things that cause portforwarding not to work?

[Sonyk]

Having a DMZ set while trying to forward individual ports will cause both to stop working.

[Penalty]

Can you check on your router admin page which ports are forwarded by UPnP? Do they appear there after plus registers them?

[master sven]

All I see on the administration page is User password, Save & Restore, Reboot and System log.