running into problems with POS NAS, XP, and 2K3

backstory -

I have a POS Buffalo Terrastation Live nas. I want to hang it off
the network and have my backup software use it as a DBB device. This
NAS doesn't support AD. The software that comes with it only runs on
XP.

The manufacturer states in a FAQ on their website that "All Buffalo
Devices are compatible with Windows Server 2003. The www.buffalotech.com
does not list this operating system because software that comes with
Buffalo Technologies devices will not run on servers" (see
http://www.buffalotech.com/knowledge...ory_id=0&sid2=
)

the issue -

I have this nas on a vlan that only the 2k3 ADC/DNS server, the 2k3
backup server and my XP client can access via second NICs in the
systems. The nas is not capable of being added to a domain (yeah, WFW
3.11 anyone?). All 3 systems can access the nas's web interface. All
3 systems can ping the nas. Only the XP system can access the shares
on the nas. The 2k3 servers can't - not even if I put "\\hostname
\share" in the address bar. It comes back saying "windows cannot find
\\hostname\share. check the spelling....." even if I put in the IP
address.

What am I overlooking? Is it a domain vs workgroup issue maybe? It
seems it has to be a setting on the 2k3 servers that Is not turned on
or something. any assistance would be greatly appreciated.

My DNS appears to be set up correctly also. And when I hang the nas
directly off the 2k3 backup server via cat 5/second nic (the preferred
final solution) it still sucks eggs.