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Intermittent CIFS/SMB Share Access Failures Due to Temporary IP Block from Excessive Invalid Authentication Attempts

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9.12.1 or later
  • CIFS/SMB
  • Environments using automation or test scripts for share access

Issue

  • Users are intermittently unable to access CIFS/SMB shares (e.g., using the net use command from Windows clients). 
  • The issue is most frequently observed in environments with machine farms or automated testing.
  • Authentication failures resolve after about one minute, but the problem recurs and disrupts workflows.
  •  ONTAP 9.12.1 or later EMS reports secd.rpc.authRequest.blocked

secd: secd.rpc.authRequest.blocked:alert]: Too many CIFS authentication attempts with wrong password from client "x.x.x.x" on Vserver "svm1"

secd: secd_rpc_authRequest_blocked_1:alert]: params: {'clientIP': '10.201.149.XXX', 'userName': 'i45260XX', 'domain': 'd-Domain', 'vserverName': 'svm_XXX'}

or

secd.rpc.authRequest.blocked:Too many CIFS authentication attempts with an invalid password from a client with IP "x.x.x.x", user name "User name" and domain "domain name" on SVM "SVM name".

  • After the above event occurs, a large number of secd.cifsAuth.problem are logged

secd: secd.cifsAuth.problem:error: vserver (svm1) General CIFS authentication problem. Error: User authentication procedure failed CIFS SMB2 Share mapping - Client Ip = x.x.x.x **[     0] FAILURE: CIFS authentication failed

  • The error "Client (IP: x.x.x.x) blocked due to continuous attempts with wrong password" is logged in secd.log 

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