Server 2012R2 AD access and replication problems

Occasional Contributor
I have a Server 2012R2 which has several symptoms related to AD access and replication.  Here are some examples and some related event log descriptions:
GPMC cannot connect to the AD.
DFRS replication fails - Error: 1726 (The remote procedure call failed.)
SMB outbound connections sometimes fail - The Kerberos client received a KRB_AP_ERR_MODIFIED error from the target server.
Knowledge Consistency Checker (KCC) was unable to form a complete spanning tree network topology.
DNS - The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly.
The server is a 2012R2 Hyper-V guest, it was hosted on a Fujitsu server 2012R2.  It has been moved (VHD only) to a Dell server 2016 host, with a new vNIC and Hyper-V switch.  The problems described show no change both before and after the move.  The SYSVOL share seems to be normal.  The Windows firewall has been disabled.  SFC /SCANNOW and DISM health checks and restores have been completed.
Some help would be appreciated!
1 Reply