DC接続がエラー "KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN" で失敗し、CIFSの問題が発生します

環境

• ONTAP 9
• Kerberos
• CIFS

問題

• ユーザはCIFS共有にアクセスできません
• ログには、マシンアカウントを使用したドメイン コントローラへの接続が失敗し、エラーKRB5KDC_ERR_C_PRINCIPAL_UNKNOWNが表示されます：

8/18/2022 09:15:58 cluster-01
ERROR secd.cifsAuth.problem: vserver (svm_cifs) General CIFS authentication problem. Error: User authentication procedure failed
CIFS SMB2 Share mapping - Client Ip = 192.168.1.1
[ 0 ms] Login attempt by domain user 'netapp\cifs' using NTLMv1 style security
[ 0] Successfully connected to ip 192.168.0.1, port 445 using TCP
[ 8] Unknown user (KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
[ 8] Failed to initiate Kerberos authentication. Trying NTLM.
[ 9] Encountered NT error (NT_STATUS_MORE_PROCESSING_REQUIRED) for SMB command SessionSetup
[ 10] Encountered NT error (NT_STATUS_AUTH_LOGON_FAILURE) for SMB command SessionSetup
[ 10] Unable to connect to NetLogon service on dcsvr.tekunasas.local (Error: RESULT_ERROR_SECD_NO_CONNECTIONS_AVAILABLE)
[ 11] No servers available for MS_NETLOGON, vserver: 6, domain: netapp.local.
**[ 11] FAILURE: Unable to make a connection (NetLogon:NETAPP.LOCAL), result: 6940
[ 12] CIFS authentication failed

• Active Directory側で、CIFSサーバのマシンアカウントが見つかりません