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LDAP servers unavailable after October 2026 DC patches

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ontap-9
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nas
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Applies to

  • NetApp ONTAP 9
  • Microsoft Active Directory (AD)
  • LDAP (Lightweight Directory Access Protocol)
  • CIFS/SMB

Issue

  • After rolling out Domain Controller security patches in October 2026, the AD LDAP servers were marked unavailable and CIFS authentication failures began occurring.
  • EMS alert:
    • None of the LDAP servers configured for Vserver are currently accessible via the network for LDAP service type
    • secd:secd.conn.auth.failure:notice]: Vserver(svm1) could not authenticate over the network to server(dc1). Error: Invalid credentials (Service: LDAP (ActiveDirectory), Operation: SiteDiscovery).
  • SECD errors:
    • AdditionalErrorMessage: 80090303: LdapErr: DSID-0C0906D1, comment: The GSSAPI target name does not match any LDAP SPN's registered for this server., data 0, v4f7c RESULT_ERROR_LDAPSERVER_INVALID_CREDENTIALS:7627 ldapSaslBindSpnego: LDAP Error (49): 'Invalid credentials'

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