Unreal Tournament 2004 internet hosting issues - Help!

[Shadowkat]

Have played UT for years - all versions. Never had the need to host games until now. No problem with LAN games - can network anyone at our home and they can join with no problems, but cannot get anyone to connect via Zoomtown internet. Running a Wextell6110(Zoomtown) router and a D-Link DI604 router for the network connections. Zoomtown says its not their firewall, but I know the settings for the game are correct. What am I doing wrong? when I try to host, Friends see my game and there is a ping - but they cannot connect to me. Would appreciate any help anyone can offer. Thanks for your time.