Error joining Samba domain with Windows 2000 Pro

[John Brown]

I am getting the following message when I try to add my Windows 2000 Pro SP3
machine to the Samba domain.

"The following error occurred validating the name "xxxxx"
This condition may be caused by a DNS lookup problem...

The specified domain either does not exist or could not be contacted."

I can see and access the server from the workgroup.