well, i play halo and halo trial,(no im not cheap its just that there are more servers, almost 50 times as many) and i can perfectly join the servers but when i start one, everyone that attempts to join gets an error like "Unable to Join Game", is this a firewall problem, my wireless pci card on my desktop is a WG311T http://www.netgear.com/products/details/WG311T.php and my router is a WGT624 http://www.netgear.com/products/details/WGT624.php and i have the latest firmware installed.
Could the trial have ran out & have you tried disabling the firewall? Sorry i don't have a clue about wireless
