Thank yours answer. I want to provide ntlm authentification for my squid proxy users :-) I have only samba PDCs. wbinfo -t checking the trust secret for domain SULI via RPC calls succeeded wbinfo -a SCHOOL\\student%student plaintext password authentication failed Could not authenticate user SULI\diak%diak with plaintext password challenge/response password authentication failed error code was NT_STATUS_INVALID_HANDLE (0xc0000008) error messsage was: Invalid handle Could not authenticate user SULI\diak with challenge/response somebody say: Just like the member server case, you must join the PDC to itself with 'net join'. On 2012-02-12 14:00, Henrik Nordström wrote: > sön 2012-02-12 klockan 13:12 +0100 skrev zumike: > > >> How can I to join for the PDC itself? >> > You don't. It's already joined when it created the domain. > > Regards > Henrik > > >