[Samba] Join 2012 Server R2 as member to NT domain

[James Fromm]

Is it still possible to join a Windows 2012 Server R2 system as a member 
to a 'pre-NT5' Samba (3.6.23) domain controller?    The Windows 'Domain 
Change' GUI errors immediately after failing the SRV lookup for the AD 
server.  Even with the SRV record in place, the GUI fails trying to 
connect to the non-existent LDAP port.

Netdom on the command line tries to work if the DC name is supplied on 
the /Domain argument.  The logs for Samba show the authentication for 
the domain administrator working fine to the Samba controller.  The 
command fails.

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C:\Users\Administrator>netdom JOIN cl40 /Domain:cust.omnis.com\glen 
/UserD:cust.omnis.com\root /PasswordD:* /VERBOSE
Type the password associated with the domain user:

Joining domain cust.omnis.com\glen

The computer rename attempt failed with error 50.

The request is not supported.

The command failed to complete successfully.
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The DNSNameResolutionRequired and DomainCompatibilityMode registry 
modifications are in place.

We are trying to stick with an NT domain so we can keep our Windows and 
Unix users in the same LDAP backend.

Thanks,
James