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Event ID: 4768 Source: Microsoft-Windows-Security-Auditing

Level
Description
A Kerberos authentication ticket (TGT) was requested.
Account Information:
Account Name: S-1-5-21-3575639598-1280693111-1939800713-1034
Supplied Realm Name: DOMAIN.LAN
User ID: NULL SID

Service Information:
Service Name: krbtgt/Domain.LAN
Service ID: NULL SID

Network Information:
Client Address: ::ffff:192.168.1.21
Client Port: 59685

Additional Information:
Ticket Options: 0x40810010
Result Code: 0x6
Ticket Encryption Type: 0xffffffff
Pre-Authentication Type: -

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, encryption types and result codes are defined in RFC 4120.
Comments
 
UWS4768 provides a list with the meaning of the various fields listed in this event and the Kerberos codes.
EV100531 (4768: A Kerberos authentication ticket (TGT) was requested) provides a detailed description of this event along with a list of various result codes and their meaning. For example, the result code 0x6 mentioned in the event description above, stands for "Client not found in Kerberos database", meaning a bad user name, or new computer/user account that has not replicated to DC yet.
See EV100530 (Kerberos Security Audit Log Events Driving You Crazy?) on suggestions on  how to troubleshoot this problem.

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