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Event ID: 91 Source: Microsoft-Windows-CertificationAuthority

Level
Description
Could not connect to the Active Directory. Active Directory Certificate Services will retry when processing requires Active Directory access.
Comments
 
From a support forum: "If this is a one time thing then not to worry. If you see this a lot you should start troubleshooting your CA and make sure that everything is connecting properly and that all your certificate information is valid."

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