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CONTAP-821088: LDAP connections to Active Directory fail with Invalid Credentials after Microsoft October 2026 domain controller updates when session-security-for-ad-ldap is "none"

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ontap-9
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nas
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Issue

  • After Microsoft October 2026 security updates are installed on Active Directory domain controllers, ONTAP SVMs that use the default LDAP client session security setting of none cannot bind to Active Directory LDAP.
  • CIFS server creation and modification, name mapping, and user and group lookups can fail.

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