samba - Sep 2009 - Samba server masquerading as another...

We're doing a test deployment of a Samba 3.0.33 server (RHEL 5.4) which
is slated to replace two existing file servers -- one running Windows
2003 (known as qalab_server) and another running Samba (known as
qalinux).

We've brought the new server up and are trying to test client access to
it to both DNS names by overriding the hosts files on certain clients.

>  [2009/09/14 17:35:14, 1] smbd/sesssetup.c:reply_spnego_kerberos(316)
>   Failed to verify incoming ticket with error NT_STATUS_LOGON_FAILURE!
I think this means that when the client sent Samba the kerberos ticket
(to prove it had authenticated) Samba was unable to verify it with the
server that issued the ticket.
> At one point I noticed an error in nmbd.log file:
> 
> [2009/09/14 17:11:50, 0]
nmbd/nmbd_nameregister.c:register_name_response(130)
>   register_name_response: server at IP 10.49.4.92 rejected our name
registration of QALAB_SERVER<20> IP 10.49.104.69 with error code 6.
> 
> Indicating that we probably lost some sort of election to the
"real"
> Win 2k3 server... however, the Fedora client via smbclient still
> happily connects without complaints with the QALAB_SERVER name...
Perhaps the Win2003 server doesn't want to recognise the Samba server?

Cheers,
Adam.