I have 2012 DC in a branch office connected via Site to Site VPN connection. I have it pointing to the DNS server at our home location and to itself as the secondary DNS server with 127.0.0.1. Everything seems to be working fine.
Every 1 or 2 hours the event log will fill up with 4015 errors - 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.
I have ran dcdiag and all shows as ok. I've also tried IPconfig /flushdns, IPconfig /registerdns, net stop netlogon, net start netlogon.
Any ideas why this is happening? Thanks.