Since yesterday I haven't been able to connect with but like, 2 people online when I'm trying to play a game. The NAT negotiations fail or something... I think it may have something to do with the fact that the AT&T parental controls on my computer got updated. So should I like check for firewalls or something? If so, where? I already went to my control panel security center to see that my windows firewall was off.
you might have to disable your virus scan then, beculse sometimes (rarely) the virus scan can somehow block all internet connections.