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LDAP

Lightweight Directory Access Protocol
Ports / IP protocol TCP 389 — LDAP / STARTTLS UDP 389 — CLDAP discovery

A protocol for interviewing and modifying a directory service.

TopicIT knowledge → About 1 min read

Simple definition

LDAP allows apps to search for users, groups and other information in a directory like Active Directory.

Technical definition

Lightweight Directory Access Protocol organizes objects in a tree and uses distinctive names, attributes and search filters. LDAP can be protected by TLS or used via LDAPS.

What is it used for ?

Application authentication, user search and directory synchronization.

Practical example

An internal application checks a user’s membership in an Active Directory group before granting access.

Common issues

  • Incorrect DN base
  • Filter LDAP invalid
  • Liaison account without sufficient entitlements
  • LDAPS certificate not approved

Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.

Related resources

Relevant topic Active Directory (AD) Microsoft Active Directory centrally manages domain identities, computers, groups and access to organizational reso... Relevant topic Domain Controller The server that hosts Active Directory and authenticates users and computers of a Windows domain Relevant topic Kerberos Kerberos is a ticket-based network authentication protocol commonly used in Microsoft Active Directory domains. Relevant topic SSL/TLS Certificate A TLS certificate binds a public key to an identity or domain name, helping clients authenticate a remote service. Relevant topic MFA Multifactor authentication (MFA) verifies identity using at least two distinct factor categories, improving account...
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