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Event ID: 9 Source: Kerberos

Source
Level
Description
The client has failed to validate the Domain Controller certificate for <domain>. The error data contains the information returned from the certificate validation process. Contact your system administrator to determine why the Domain Controller certificate is invalid.
Comments
 
From a newsgroup post: "Please enable Autoenrollment in the Default Domain Controllers policy. (Go to Computer Configuration -> Windows Settings -> Security Settings -> Public Key Policies -> Properties of Autoenrollment Settings and enable "Enroll certificates automatically" and "Update certificates that use the certificate templates")".

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