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Get error "The username or password is incorrect" because user is in Protected Users group

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • CIFS/SMB
  • Active Directory

Issue

  • When a user navigates to a CIFS LIF IP in File Explorer, a credential prompt pops up with error:  The username or password is incorrect

netw_cred_error.png

 

  • When authenticating the Windows user through the specified node using the specified Vserver's configuration, it returns error code 0xC000006E 

  ::*> vserver services access-check authentication login-cifs -node node1 -vserver svm1 -user UserA

Note: Expected would be the user's Windows and UNIX credentials.

  • Affected user is a member of group Protected Users

::*> vserver services access-check authentication show-creds -node node1  -vserver svm1 -win-name UserA

  • Packet trace shows that NTLM authentication is failing
700   2024-02-06 15:42:05,721904    xx.xx.xx.xx      yy.yy.yy.yy     SMB2        Session Setup Request, NTLMSSP_NEGOTIATE
701   2024-02-06 15:42:05,722479    yy.yy.yy.yy      xx.xx.xx.xx     SMB2        Session Setup Response, Error: STATUS_MORE_PROCESSING_REQUIRED, 
NTLMSSP_CHALLENGE
702   2024-02-06 15:42:05,722852    xx.xx.xx.xx      yy.yy.yy.yy     SMB2        Session Setup Request, NTLMSSP_AUTH, User: DOMAIN\UserA
703   2024-02-06 15:42:05,725141    yy.yy.yy.yy      xx.xx.xx.xx     SMB2        Session Setup Response, Error: STATUS_LOGON_FAILU

 

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