I can turn my firewall on and off, but for some reason, on this brand new server 2003 installation, I can't modify anything in the exceptions list. I'm logged on as the domain administrator. I verified and confirmed that the domain admin is indeed in the local administrators group. So what the hell? I've checked the group policy (Computer Configuration > Administrative Templates > Network > Network Connections > Windows Firewall > both standard AND Domain Profile) and everything is set to Not Configured.