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Logs in SmartConsole show an error indicating multiple failed login attempts. ; Logs in SmartConsole logs and kernel debug on a Security Gateway show Kerberos failures: Minor code: Wrong principal in request ; Issue is observed after updating Windows Server / Domain Controllers to the latest Microsoft version / updates.
Recent Microsoft updates KB5073381 related to CVE-2026-20833 change the Kerberos behavior - RC4 encryption method are no longer issued by default, and AES encryption is used by default. If the service account used in the SSO configuration (configured under the LDAP Account Unit object) is still configured to use RC4, Kerberos authentication may fail, leading to repeated failed logins and the observed "Minor code" errors.
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