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Event ID: 29 Source: KDC

Source
Level
Description
The Key Distribution Center (KDC) cannot find a suitable certificate to use for smart card logons, or the KDC certificate could not be verified. Smart card logon may not function correctly if this problem is not resolved. To correct this problem, either verify the existing KDC certificate using certutil.exe or enroll for a new KDC certificate.
Comments
 
In my case it was really simple. We don't have a CA and so we have to ignore this warning. The domain controllers are on 2008 R2. See ME967623.
See the link to T734096 for information on how to solve this problem.

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