cannot host online games

[wormbasher]

I can play games online fine, i have the most recent patch, however when i try hosting the screen comes up where i can select the map/weapons etc but no one can join. I know it's not just people choosing not to join as once i quit this screen and go back there are people saying that they cannot join my game.

Please could anyone tell me what i'm doing wrong or if there is something i need to download to get this to work.
Thanks in advance.

[bonz]

www.nanacide.com/wahelp