| Event Id | 18 |
| Source | Microsoft-Windows-Kerberos-Key-Distribution-Center |
| Description | During TGS processing, the KDC was unable to verify the signature on the PAC from %1. This indicates the PAC was modified. |
| Event Information | According to Microsoft : Cause This event is logged when TGS processing, the KDC was unable to verify the signature on the PAC. Resolution This is a normal condition. No further action is required. |
| Reference Links | Event ID 18 from Microsoft-Windows-Kerberos-Key-Distribution-Center |
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