I am setting up an ISA server on Win2K, but our PDC is still WinNT4. I tried joining the domain, but noticed that none of my rules worked for SecureNAT clients. When I removed the ISA server from the domain, everything worked again. We will be upgrading to Active Directory this year. Should I join the current WinNT domain? Will I lose any functionality if I don't? Thank you, Karl Schneider