Examples of 4771
-----------------------------
Kerberos pre-authentication failed.

Account Information:

   Security ID:  ACME\administrator
   Account Name:  Administrator

Service Information:

   Service Name:  krbtgt/acme

Network Information:

   Client Address:  ::ffff:10.42.42.224
   Client Port:  50950

Additional Information:

   Ticket Options:  0x40810010
   Failure Code:  0x18
   Pre-Authentication Type: 2

Certificate Information:

   Certificate Issuer Name:  
   Certificate Serial Number:  
   Certificate Thumbprint: 

Certificate information is only provided if a certificate was used for pre-authentication.

Pre-authentication types, ticket options and failure codes are defined in RFC 4120.

If the ticket was malformed or damaged during transit and could not be decrypted, then many fields in this event might not be present.