We have a new DC that we are adding to our existing child domain. It seemed to go in fine but there are some issues with when validating trust I get the attached error.
I do have in event log under DNS: 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.
The only other error is: The DFS Namespace service could not initialize cross forest trust information on this domain controller. However I have other branch offices that have the same trust from child to parent and they are fine so trust seems fine.