samba - Feb 2004 - 2003 server

I have configured samba ver 2.2.1a-4 on RH 7.3 machine as PDC and suucessfully 
joined win-xp clients to the domain. But now I need to add windows 2003 server 
to same PDC. It does not work.

Did anyone try this out, please help me.

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Thanks,
Murali