I am also having problems hosting with my wireless ADSL Router.
I have a Desktop PC running XP Pro with a direct connection to the router. My laptop uses wireless. All the usual stuff works, including MSN Voice, but only after enabling DMZ and routing to the desktop PC!!
I run Norton firewall on both PC's, but have even - dangerously - disabled it in an attempt to host.
I can connect with no difficulty to a game hosted elsewhere, but others cannot connect to a game that I host!
I have a dynamic assigned IP from my ISP and router auto-assigned IP's to my PC's.
I'm greatly confus