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All evil in the world of AD comes back to DNS.
Is the DNS suffix on the DC correct?
Are the SRV record being created correctly? You should have a delegation record in the zone file, and a seperate .msdcs zone with your SRV records for the domain. If the SRV records are not being created properly, the DC does know its a DC! All boxes, DCs included, rely on the SRV records to confirm which machines are DCs.
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