Bringing the question further, as I have the same problem..
Only dif is it seems Hellspawn has a router, I don't.
I use ADSL, and have a splitter (Shouldn't matter.) and have a SpeedTouch 510 ADSL-Modem, from there the line goes directly into my computer. Can anyone help me?
Also.. I have thought about opening the Norton Auto-Protect Firewall that I have, but I can't find the Port Forwarding stuff. :?