[Samba] Administrator doesn't have admin rights on workstation

[Steve A]

Hello, I'm running FreeBSD-6.1, and Samba 3.0.22 with a Windows XP (SP2) 
client.

As per subject line, administrator doesn't have administrator rights on the 
workstation.

--- 'net groupmap list' gives,

Domain Admins (S-1-5-21-3323006203-4037909810-1162086780-3003) -> ntadmins

--- 'pdbedit -Lv' includes,

Unix username:        administrator
NT username:
Account Flags:        [U          ]
User SID:             S-1-5-21-3323006203-4037909810-1162086780-3006
Primary Group SID:    S-1-5-21-3323006203-4037909810-1162086780-3003

--- '/etc/passwd' includes,

administrator:*:1003:1001:Windows Domain 
Administrator:/home/administrator:/usr/sbin/nologin

--- '/etc/group' includes,
ntadmins:*:1001:


>From the above, I see that the Primary Group SID for the smb Administrator 
account is the same as the one listed for Domain Admins using pdbedit.  The 
'administrator' password is the same for both smb and system accounts, and I 
can log in to the workstation successfully.

I even tried mapping Domain Admins to wheel, setting an smb password for 
root, and logging on to the client as "root" instead of administrator.  I 
can write over the network to root's home, but I am sitll not an 
administrator of the Domain so I can't install software on the client.

Which step have I missed or what have I done wrong?

Many thanks,
Steve :)