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In my example below, we have our Essentials server, a Router and a client laptop that is not joined to the domain.The router is running DHCP and is configured to issue an external DNS Server IP Address to the DHCP Clients.The only thing I had to do after this was, flush the dns entries on the clients with: ipconfig /flushdns After this they have poped up in my reverse lookup zone. The fix of adding the DHCP server to DNSupdateproxy group solved my issues. Probably the best title for a blog post ever right?If it didn't, you might try looking in the DNS event log on the server to see if there are any issues there.I'm not sure if it would say whether or not a client failed to register or not, but may show you other issues with DNS if they exist. I believe you have a permissions error, I had a similar issue and although the how to was directed at Windows Server 2012.
3) If the issue is that your reverse zones are mismatched between domain controllers (meaning a host was able to register with one of the DCs, but the registration did not get replicated to the others) it could mean the zones themselves aren't replicating between domain controllers.
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. This could be due to a couple of different things: 1) Are your clients obtaining IPs via a Windows DHCP Server?
This article covers the default security settings for DNS zones: the settings are jacked up (or even if they are fine), you might try just blowing away the reverse zone and recreating it since you basically have a non-functioning reverse zone as it is...
Try running an "ipconfig /registerdns" on one of the clients and see if it adds a record to the reverse zone.