WinNT/XP: Login problems, Domain Controller issues?

[cw42]

Running a WinNT server, with various PCs as XP and Win2k. Two of the PCs are not able to join the domain saying the user/pw is incorrect (i'm positive that the u/p i'm using are right). The only way i've been able to log onto the PCs is to unplug the ethernet, then put the u/p to log on.

Any ideas on how to fix this problem?

 

[TG2]

Domain controller NT4, 2000, 2003 or 2003 R2?

Are the PC's giving you a problem all one type OS?
Are they in the same general location (ie both NT4 machines in Building 6)?
Your sure they are doing a domain logon and not local logon (Logon To:[domain] instead of Logon To:[computername])

 

[cw42]

Domain controller NT4, 2000, 2003 or 2003 R2?
NT4

Are the PC's giving you a problem all one type OS?
No. One is Win2k, the other is XP.

Are they in the same general location (ie both NT4 machines in Building 6)?
Yes.

Your sure they are doing a domain logon and not local logon (Logon To:[domain] instead of Logon To:[computername])
Yes.