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NTLM authentication fails due to machine account password mismatch

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Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • CIFS
  • NTLM

Issue

  • CIFS users are unable to access the CIFS shares due to NTLM authentication failures
  • The CIFS server is unable to connect to the  netlogon service on the DCs discovered

EMS / secd log example

Failure Summary:
Error: Ontap admin cifs authentication basic procedure failed
  [  0 ms] Login attempt by domain user 'cii_encrypt/RAuomQCHJ+wnzpX3orc4tFYcQXYY74mKV0hmDpgSabc=/cii_encrypt\pii_encrypt/RAuomQCHJ+wnzpX3orc4tCEmQxSUkOODm2hLrcXanLE=/pii_encrypt' using NTLMv2 style security
  [   275] Successfully connected to ip 10.11.12.11, port 445 using TCP
  [  1108] Successfully authenticated with DC dc1.domain.com
  [  4339] Unable to connect to NetLogon service on dc1.domain.com (Error: RESULT_ERROR_GENERAL_FAILURE)
  [  4538] Successfully connected to ip 10.200.138.228, port 445 using TCP
  [  5146] Successfully authenticated with DC dc2.domain.com
  [  7135] Unable to connect to NetLogon service on dc2.domain.com (Error: RESULT_ERROR_GENERAL_FAILURE)
  [  7416] Successfully connected to ip 10.188.0.34, port 445 using TCP
  [  8268] Successfully authenticated with DC dc3.domain.com
  [ 11075] Unable to connect to NetLogon service on dc3.domain.com (Error: RESULT_ERROR_GENERAL_FAILURE)
**[ 11075] FAILURE: Unable to make a connection (NetLogon:DOMAIN.COM), result: 6942
  [ 11075] Ontap-admin-login-cifs failed
  [ 11075] Retry requested, but the retry window (7000 ms) has expired; giving up.  

  • Establishing the Netlogon secure channel fails

EMS / secd log example

Fri Oct 25 2024 15:29:18 +08:00 [kern_secd:info:9504] | [000.134.860]  ERR  :  RESULT_ERROR_GENERAL_FAILURE:3 in NetrEstablishSecureChannel() at src/Actions/MsrpcServices.cpp:4465
Fri Oct 25 2024 15:29:18 +08:00 [kern_secd:info:9504] | [000.134.867]  ERR  :  RESULT_ERROR_GENERAL_FAILURE:3 in ensureSChannelKeyEstablished() at src/connection_manager/secd_connection.cpp:338
Fri Oct 25 2024 15:29:18 +08:00 [kern_secd:info:9504] | [000.134.871]  ERR  :  RESULT_ERROR_GENERAL_FAILURE:3 in connect() at src/connection_manager/secd_connection.cpp:1531

  • Issue started since cifs password reset failed

Audit log example

vserver cifs security modify -vserver svm1  -is-aes-encryption-enabled true :: Error: Password update failed. Reason: SecD Error: no connections available

 

 

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