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DC connection fails with error "KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN" causing CIFS issue

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9 
  • Kerberos
  • CIFS

Issue

  • Users do not have access to CIFS shares
  • Logs show connection to domain controller using machine account fails with error KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
    Example:
    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)
    Press <space> to page down, <return> for next line, or 'q' to quit...

    [ 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
  • on Active-Directory side, the machine acount of the CIfs server is not found.

 

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