Event ID: 4776
Occurs when the key distribution centre fails to issue a Kerberos ticket granting ticket.
Only DCs get this event.
Could be caused by:
DC does not have a certificate for smart card authentication installed.
The users password has expired
the user has provided an incorrect password.
Check for result codes if the authentication fails.
0x18 - pre-authentication information was invalid.
0x12 - client's credentials have been revoked (account might be disabled, expired or locked)
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