Enumerating Sessions???

[Sledgehammer]

Okay we have been playing Novalogic Joint Op's for a while and have been playing with a group of around 7-10 using Hamachi to link up the lan connection.. but recently we all decided to try a few games online with everyone (great idea alot more fun got our ass's kicked ) but the problem is this when one of us hosts a game i cant seem to join as there are 3 of us in the same house one of us can get on the game but the other two get this error.. i have been on a few web sites doing loads of things with the router but nothing we was gaming last night and someone suggested this site so i thought i would ask in case anyone knows??

i have a netgear router and all 3 connections are wired all 3 pc's are running win xp pro (coz vista is turd)..(my opinion)

dont know if this is a pc problem or game problem so posted in this first.

cheers

ps sorry for dup post