samba - Jan 2003 - no access to passdb when domainlogin from xp client

we have problems with the samba domaincontroller. Upon login of a win XP machine
we get the error message:
Can not open passdb.

What are the reasons for this? how to avoid the problem? User gets veryfied, but
not password.

thanks a lot,

greetings berthold christukat
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