Hi Stu,
How many DNS servers are you using? I would confirm all your DC's point to
the correct DNS servers internally (whether one or all are running DNS).
You can use the netdiag utility from the windows support tools to confirm
DNS has the correct records.
Make sure your 2003 server points to a valid DNS server for the domain.
Also, use the FQDN when entering the name of the domain you wish to join.
Thank you,
Matthew Fresoli
Microsoft Network Support
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