Missing SPN causing domain replication issues

I was recently working with a customer where one of their Active Directory would not replicate. They were receiving Event ID 1645 in their Event logs: Event Type: ErrorEvent Source: NTDS ReplicationEvent Category: Replication Event ID: 1645Date: 2/12/2015Time: 11:12:15 AMUser: EveryoneComputer: DC-04Description:The Directory Service received a failure while trying to perform an authenticated RPC call…

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