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domain name system - Reverse DNS not automatically updating on Windows DNS server

We use windows server 2003 for DNS on our network. The forward DNS entries ("A" records) for windows machines on the domain are populated automatically. However, the reverse DNS entries ("PTR" Records) are not. The reverse lookup zone exists, and I can add entries to it manually, but it doesn't automatically populate. Dynamic updates are enabled for both the forward and reverse zones. What am I doing wrong?

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