DNS Errors (Event 4015) on one DC when I reboot the other

I have two Server 2012 Domain Controllers. Each has DNS and DHCP with failover. The NIC properties of each server have the primary DNS pointing to the other server and the secondary DNS pointing to itself (127.0.0.1).
DC1 holds the
Schema Master, Domain Naming Master, PDC Master, RID Pool Manager and Infrastructure Master roles. Both DCs are Global Catalogs.
When I reboot or turn off DC1, DC2 logs an error 4015...
The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The event data contains the error.
...every second.
Does anyone know how to fix this?

Well, it makes sense that it should point to it self, as it is always available. If you point to a another dns as primiary, dns request will slow down as long as that dns server is down. I believe you've set up both dns's to forward any non resolveable
requests?
For the FSMO roles, you can always move them if you have a scheduled downtime.
Best Regards,
Jesper Vindum, Denmark
Systems Administrator
Help the forum: Monitor(alert) your threads and vote helpful replies or mark them as answer, if it helps solving your problem.
Yes, both DNS's are set to forward non-resolvable requests. I just ran the Best Practices Analyzer on DC1 and it gave me several warning but one of them is not correct. It says...
Error DNS: DNS servers on Ethernet should include the loopback address, but not as the first entry.
Problem: The network adaptor Ethernet does not list the local server as a DNS server; or it is configured as the first DNS server on this adaptor.
I am including the loopback address and it is not the first entry. I don't know why it misidentified this.
EDIT: I think it must be seeing the IPV6 address. If I do an ipconfig /all, the first entry in the DNS server list is...
::1
10.1.3.4
127.0.0.1
Can I set it so that the IPV4 addresses are first in the priority?

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