2000 domain controller will not resolve IP URL to NAS while other desktops and domain controllers can

I have a 2000 domain controller which I am attempting to install a NAS for disk to disk backups using Veritas. The NAS is fully setup but for some reason when I try to connect to the NAS from an IP URL I get an error "remote computer is not available". When I try to access the NAS from a web browser on the same machine it resolves the device to the managment console. When I try to resolve the IP URL from other desktops or domain controllers on the LAN / WAN it works just fine, just not  from this specific 2k conroller.