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Security Fundamentals & Crypto · Foundational

Lightweight Directory Access Protocol over SSL (LDAPS)

LDAP secured with TLS on TCP port 636 to protect directory queries and credentials.

Definition

LDAPS encrypts the entire LDAP session, protecting bind credentials and directory data. An alternative is StartTLS on port 389, which upgrades an LDAP connection to TLS. Microsoft recommends requiring LDAP signing and channel binding on domain controllers.

Example

An application is configured with ldaps://dc01.example.com:636 for user lookups.

Exam tip

LDAPS = 636; secure Global Catalog = 3269.

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