[Samba] XP cannot get into smb-PDC domain

[Robert Schott]

Trying to authenticate a machine named testmachine on a pdc-smb domain. If 
manually creating machine account as described in how-tos I get access 
denied. If automatically generating a new mach.account I get another wierd 
msg telling me something like I am using a workstation account and I have to 
use a normal user account or local account to access this server.

If I say that this xp-box should use a workgroup I can use the server but 
cannot authenticate.

Any ideas where to start searching?

Robert