Problem partly solved. Due to a syntax error in the NT testuser the user wasnt allowed to access the samba-server. :( However the PDC of the DOMAIN INFO trusts the users of the groups W3_BD and W3_BT of the DOMAIN BYGGDOK (PDC=BYGGSERV). These users should be allowed to access the samba-server too. What do I have to do to accomplish that? I tried: domain groups = W3_BD W3_BT which did me no good. (Cant find any documentation on that option) /Roos