Hi I have set up a Samba-environment with , at the moment, one PDC and three BDC's. LDAP-master at the PDC and slaves on the BDC's. I can logon to the domain through whichever DC is choosen but when i try to join a machine the PDC MUST be available. The client seems to check among the avilable DC's but if the PDC is down it just tells me it can't find a domain-controller for the domain. If the PDC is up and running it gets selected to process the join. As I understand it, it should be possible to join a machine via the BDC as long as the LDAP-master is available. Correct? If I configure the BDC with "Domain master = yes" it is accepted as a "valid DC" and joining the client works. The client i have tested with is WinXP SP2. Anyone have any ideas or corrections? It's not a major showstopper but for redundancy and load-balancing it would be nice to get this working if possible. After all the domaincontrollers reside in 4 different cities... /Ulf -- Ulf Nor?n IT-division, Mid Sweden University