People often ask me about some firewall software to protect their servers (Windows2000). I usually set up routers with IP filters... I mean REAL hardware firewalls, I avoid using firewall software on server systems (at this time those customer people complain I want to spill the most money from them). I tested some zone alarm pro (brr), sygate... commercial stuff on windows2000 server... apart from not being certified applications for that system, they often screw up services (worse on domain controllers). I was wondering... anyone knows a firewall software certified to run on W2k Server? and anybody of you had that running with no hassle?