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Event ID: 1645 Source: Active Directory

Source
Active Directory
Level
Error
Description
The Directory Service received a failure while trying to perform an authenticated RPC call to another Domain Controller. The failure is that the desired Service Principal Name (SPN) is not registered on the target server. The server being contacted is <server>. The SPN being used is <SPN>. Please verify that the names of the target server and domain are correct. Please also verify that the SPN is registered on the computer account object for the target server on the KDC servicing the request. If the target server has been recently promoted- it will be necessary for knowledge of this computer's identity to replicate to the KDC before this computer can be authenticated.

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