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 FSMO, RID Master, PDC Master 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?