Kerberos身份驗證票證 - 事件ID 4768 - 審計失敗

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我正在使用Kerberos來驗證用戶及其失敗。在事件查看器審計失敗細節以下Kerberos身份驗證票證 - 事件ID 4768 - 審計失敗

A Kerberos authentication ticket (TGT) was requested. 

Account Information: 
    Account Name:  ax 
    Supplied Realm Name: TEST.COM 
    User ID:   NULL SID 

Service Information: 
    Service Name:  krbtgt/TEST.COM 
    Service ID:  NULL SID 

Network Information: 
    Client Address:  ::ffff:2.2.2.60 
    Client Port:  38532 

Additional Information: 
    Ticket Options:  0x40800000 
    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.

結果代碼爲0x6意味着用戶沒有在Kerberos數據庫存在，但是我有一個用戶已經在AD配置。這是Windows Server 2008（非R2），用戶帳戶名稱爲「axtest」，用戶登錄名稱爲「ax/mytest」。域名是test.com。從wireshark，我可以看到我的客戶端正在發送AS-REQ，其中包含正確的2個名稱字符串項目ax & mytest。我不知道它爲什麼失敗。