Event ID 5722 is logged on your Windows Server-based domain controller My Original error – DC=DomainDnsZones,DC=<domain>,DC=co,DC=uk Default-First-Site-Name\<DC> via RPC DSA object GUID: eecaebcb-34ce-4ea0-8966-65a6a6bd7699 Last attempt @ 2017-01-06 10:49:52 failed, result 8451 (0x2103): The replication operation encountered a database error. 793 consecutive failure(s). Last success @ 2016-12-30 19:48:26. The following saved me from a demote and Read more about Event ID 5722 – DomainDnsZones partition replication issues / result 8451 (0x2103): / The replication operation encountered a database error.[…]