An error occurred while validating the server dns

For this reason, use caution when configuring the loopback address on an adapter if the server is also a domain controller.The loopback address should be configured only as a secondary or tertiary DNS server on a domain can send through some other links later, but DNS config is something that has always been up for debate.

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No, it should always be itself as the primary, and only DNS Server.

DNS replicates amongst all the AD servers (regardless of this setting), so no need to reference other servers.

The users are experiencing 5-10minute logon periods.

probably time to go deeper then enable the DNS Client Events/Operational log and have a look at working versus non working.

From only one DC to the other I am having nslookup issues.