The Avast4 free edition has Network Shield, P2P shield and things.
I am playing a very minor game which after i installed Avast, i can no longer connect online mode. I think the Network Shield or P2P shield is blocking it. I don’t have any other firewall and all of the ports are open, so Avast would be the reason left.
I do not have a virus. I have recently reinstalled XP, and i don’t go to porn sites and untrustable sites.