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Kerberos Failure Codes
| Error Code | Cause |
| 6 | The username doesn't exist. |
| 12 | Workstation restriction; logon time restriction. |
| 18 | Account disabled, expired, or locked out. |
| 23 | The user's password has expired. |
| 24 | Pre-authentication failed; usually means bad password. |
| 32 | Ticket expired. This is a normal event that get frequently logged by computer accounts. |
| 37 | The workstation's clock is too far out of synchronization with the DC's clock. |