LDAP Channel Binding and LDAP Signing

This article explains LDAP Channel Binding and LDAP Signing risks in Active Directory, highlights Microsoft’s Server 2025 change that enforces LDAP signing by default, describes relevant attack vectors (MITM and relay attacks, CVE-2017-8563), and provides practical auditing and remediation guidance—enable LDAP diagnostics, monitor Event IDs 2889/3074/3075, and apply GPO settings incrementally to enforce signing and channel binding without breaking services.