Nortons Firewall
 

My friend has two computers on the same cable line but one of them can't use game spy,they have a Norton Firewall running and when it is switched off they both can use gamespy.
Do they have to open a port on the firewall and if so how! and if not does anyone know what is wrong.

More then likely it's the firewall, check symantecs web site to see if there is a Q/A regarding the use of game spy and there software. Or try Gamespies web site.

sorry could not help more but I'm not familiar with Norton's firewall software.

Good luck

Cheers mate.