用戶端提供無效的輸入權杖做為證據。此權杖包含來自信任主體的有效 Kerberos AP 要求，但無法以 Kerberos 工作階段金鑰來確認簽章。該權杖可能已遭到篡改。金鑰識別元欄位包含主體名稱。

The client presented an invalid inbound token as evidence. The token included a valid Kerberos AP-Request from a trusted principal, but the signature could not be verified with the Kerberos session key. The token may have been tampered with. The key identifier field contains the principal name.