Check your DNS settings. Your servers NICs should only have entries for internal DNS servers. In your DNS Snap-In, your ISP DNS servers should be entered in the Forwarders tab.
Check your DHCP scope too and make sure that it is only providing local DNS servers.
I added the Reverse settings in DNS, which it sounds like I didn't need to do. Before adding this, I ran DCDiag and the error was that the DNS name could not be resolved. Other DCDiag tests seemed to run though.
Should I uninstall the Reverse DNS? If so, Do you know what I would need to do to get rid of the DNS name not resolving please?
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