Guys, I've been using samba PDC with LDAP backend for about 2 years now, and they're working just fine. All this time, each time I join a new computer (PC with win XP Pro, Me, win98), I use the root account and its samba password. The problem is, I can use the root to login into the domain too, which something I don't like. If i used the parameter "invalid users root" via smb.conf, then I cannot join any PC into the domain. I roamed into samba official How-to ( http://us1.samba.org/samba/docs/man/Samba-HOWTO-Collection/NetCommand.html#id2599196) and found something interesting in the "Administering User Rights and Privileges" part, the net rpc command. My goal was to create a new user, other then the root, with a privillege restricted to merely joining PC's into the domain (SeMachineAccountPrivilege). But when I tried one of the command there, e.g. the 'net rpc rights list -U root%rootPassword', nothing came up. Is this normal? Then how to do it right? FYI, I'm using samba-3.0.20b-3.3 with openldap2-2.2.27-6, and openSuSe 10.0. Thank you for your help. Regards,