Why isn't the TLD being used when joining a domain?

I'm working on a test Active Directory domain: domtest.local
When I'm joining an XP PC to the domain, it only works if the domain I use is domtest, if I try domtest.local the PC cannot connect. The eventual idea is to have a domtest.local and a domtest.com domain structure and I'd like to know why the .local isn't working.
The computer does show in the Computers OU.
CapricaAsked:
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dfxdeimosCommented:
You are pointing to a DC for DNS?

Can you ping domain.local?
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CapricaAuthor Commented:
Yes, I can ping domain.local. The server is DC, DNS, DHCP, AD. It appears to be working properly, it's the domain joining that has me puzzled and makes me suspicious that all may not be right.
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dfxdeimosCommented:
As long as you can ping the domain via the "domain.local" address, and the client is pointed towards the DC for DNS I can think of no reason you couldn't join the domain via its FQDN.

Can you try it again on a different PC (if you have it) and immediately after the failure look at the logs of both the DC and workstation for relevant entries?
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CapricaAuthor Commented:
Thanks, will give it a try. I'll have to build a machine, I'll post back once it's done.
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dfxdeimosCommented:
Cool
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CapricaAuthor Commented:
Thank you for you help, after checking the logs and then going through the SRV records it turns out some SRV records were missing. Using the Windows Support Tools netdiag /fix has corrected the issue.
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Windows Server 2003

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