Event ID - 1566

Event Id1566
SourceActive Directory
DescriptionAll servers in site %1 that can replicate partition %3 over transport %2 are currently unavailable.
Event InformationAccording to Microsoft:
All domain controllers in the specified site that can replicate the directory partition over this transport are currently unavailable.
Verify that the network is not down and determine why the domain controllers are not available.
Reference LinksWindows Operating System (Active Directory)

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