in the Sharing section of the System Preference, there are a few default services such as Personal File Sharing, Windows Sharing... and so on... that i can set to open. however, these are very limited. there are certain other ports that i need to open such as 6112 to 6119 for Warcraft III, in order to host games on battle.net right now, i often find myself having to turn the firewall off in order to host my own games. if the firewall is turned on, no body would see my game at all. please help!!