Sorry 9,
I should have been more clear. Connecting from a domain to a DMZ behind a Cisco firewall. I can reach the system from a Remote Desktop, but only if I use the IP address; those outside of our domain (the outside world) can reach the system and its content with no problem; I simply cannot. I have exhausted myself checking DNS tables, etc., but to no avail. Can't reach the machine by its name anymore...another funny tweak to this is that there is one system INside the domain that acts precisely the same -- can get to it via IP address, but not by UNC path.
The hard part is, everyone says 'check with whoeever runs your network;...but that's me. I took over when the last guy left, but this is outside my ken.
Any ideas? Thanks for the reply!