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Event ID: 5712 Source: NETLOGON

The partial synchronization request from the server <server name> failed with the following error: <error code>
As per Microsoft: "The specified server is down or was restarted". See MSW2KDB for additional information about this event.
Article ME131366 was helpful to me. Essentially, 5712 errors are normal after a reboot of the PDC; force synchronization from each BDC to re-establish a secure channel from each to the PDC, and the errors go away.
The following articles provide information related to this event: ME173882 and ME197985.

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