Recommended DNS Settings for Single DC

DNS servers on <adapter name> should include the loopback address, but not as the first entry

Primary: IPV4 Address
Secondary: 127.0.0.1

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/ff807362(v=ws.10)?redirectedfrom=MSDN