[Samba] Samba with XP Client: The user name could not be found

[Monte L. Early]

I am trying to connect an XP Pro workstation to a Samba server configured as 
PDC.  I can access shares from the XP client by simply mapping the resource 
and entering login/pass.  However, whenever I attempt to connect to the 
domain, it gives me the error:

"The user name could not be found."

I am using the same user name in Samba, Linux and XP.

Any suggestions?