Oh, im sorry, unfortunately im no familiar with NS2003 at all. On win systems i think i recall the possibility to actually define ports (source and destination) with Tinys firewall. I couild be mistaken though. Im only familiar with linux firewalls, or firewall strategies. (iptables for example). Sorry i cant be of any help here, but im willing to learn and test all the things that this thread might come up with (xcept for NS2003 ) which i do not like for personal reasons)