[Fedora-directory-users] So I have a Samba PDC + FDS, What now?

I have successfully completed the Howto:Samba documentation. I think I have a working Samba PDC with a FDS backend. I can add users with smbpasswd -a. The problem I have is connecting a windows workstation to the domain. The connection fails complaining about the user name or password. What user should I be using to add workstations to the domain, a member of the 'Domain Admins' or the Administrator user? I have tried both and neither seem to work. Thanks.