Running NetWare 6.5 SP6 with post patches
Clients: XP SP2 & NetWare Client 4.91 SP2 with post patches

Some XP clients running the Client for Microsoft Networks cannot access
NetWare volumes using the UNC path with the following error:
"UNC path" is not accessible. You might not have permisson to use this
network resource.

The funny thing is that mapped drives to the same volume are OK, even a
mapped drive through Windows explorer using the UNC path works??
Cannot even browse to the server itself, can see the volume but when
clicking on the volume the same error occurs. UNC path using the CIFS
path works.

I have seen this same error all over the forums generally in reference
to Micosoft networking not NetWare volumes.