LDAPS Failures on a Domain Controller: Certificate Checks and LDAP Signing Triage

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A helpdesk team reports that a directory sync fails with 'Strong Authentication Required' after a new Windows Server 2025 domain controller was added, and that LDAPS connections to another controller fail since its certificate renewed. The guidance argues these are distinct problems, since LDAPS failures stem from certificate availability, serving, trust, or name matching, while signing and channel binding rejections are deliberate DC enforcement. It cautions against disabling signing domain-wide, deleting certificates, or setting channel binding to Never, because these remove diagnostic evidence and can reopen security risks. It recommends a step-by-step chain of checks covering port reachability, certificate presence, trust, name matching, and unsigned binds, using tools such as Test-NetConnection, certutil, and Get-WinEvent. The article also points to related guides for certificate enrollment and revocation issues.

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