Samba As PDC: "The Trust Relationship ... Failed"

When I try a net logon from Windows 7 64-bit Business (don't have any other Windows machines), I get "The trust relationship between this workstation and the primary domain failed". The discussion I've found around the Web regarding this error message seems to be only in the context of the 30 day password expiry issue, where the solution is to simply rejoin the domain.I have this problem *always*, and rejoining does not help. I have not been able to do a net login at all, from the first time I tried. At the same time, there's no problem accessing the Samba shares by going to \SMB in Windows Explorer and logging in with the same user accounts. Code: # smbstatus Samba version 3.6.7-48.12.1-2831-SUSE-SL12.2-x86_64 The LAN is on 172.16. and the Samba machine is also the LAN's DNS server; not using LDAP. We had been using Samba for simple file sharing, with no domain functionality enabled, and with the Windows machines on the network configured as members of the workgroup. We recently decided to set Samba as a PDC and support roaming profiles, and have been blocked by this trust error.

The profiles directory was chmod 2775 and its group changed from root to users. The netlogon directory is 755. Initially, in smb.conf the name resolve order was starting with dns, but Windows 7 kept giving me an error about not finding the domain when I tried to change from workgroup to domain, so I took that out and set wins as the first item in the list.

Code: # cat /etc/samba/smbusers:
root = administrator Administrator admin
nobody = guest pcguest smbguest I added root to smbpasswd.

I also executed the following:

Code: net groupmap add ntgroup="Domain Admins" unixgroup=root rid=512 type=d
net groupmap add ntgroup="Domain Users" unixgroup=users rid=513 type=d
net groupmap add ntgroup="Domain Guests" unixgroup=nobody rid=514 type=d

[code]....

Brought in a new Windows 7 64-bit machine and that one works... So it seems to be a Windows configuration issue, but what other settings could possibly cause this authentication failure? The new machine is a recent clean install and uses MSE as antivirus, whereas the older workstations use AVG and Ad-Aware. But I doubt the antivirus could cause the difference. And I don't see any difference in the network configuration of the machines.