With the release of Windows Server 2025, Microsoft has introduced a significant change by enforcing LDAP Signing by default through a new policy setting. This article revisits the critical security concepts of LDAP Channel Binding and LDAP Signing, noting that many Active Directory environments still lack these configurations despite years of availability. The author emphasizes that while Server 2025 takes steps toward security, organizations must still proactively audit and configure these settings to mitigate credential exploitation and relay attacks.
The article provides a detailed breakdown of the differences between LDAP Signing and Channel Binding, explaining how they protect against person-in-the-middle and relay attacks. It offers a structured remediation path, including specific Event IDs to monitor (such as 2889, 3074, and 3075) and GPO configurations. The core message is that a defense-in-depth strategy, combining Secure LDAP (LDAPS) with enforced signing and binding, is essential for hardening Active Directory against modern threat vectors.
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