Port 636

Q: What is port 636?

Encrypted LDAP directory access over TLS (LDAPS) LDAPS on port 636 is the TLS-encrypted version of LDAP (port 389). TLS is established immediately upon connection (implicit TLS), protecting credentials and directory query results in transit. It is used for secure authentication and directory lookups against Active Directory and OpenLDAP servers. Always prefer LDAPS over unencrypted LDAP (389) to protect user credentials.

LDAPS

Encrypted LDAP directory access over TLS (LDAPS)

Port

636

Protocol

TCP

Service

LDAPS

Security

Restricted

Full name: LDAP over SSL/TLS

What is port 636?

LDAPS on port 636 is the TLS-encrypted version of LDAP (port 389). TLS is established immediately upon connection (implicit TLS), protecting credentials and directory query results in transit. It is used for secure authentication and directory lookups against Active Directory and OpenLDAP servers. Always prefer LDAPS over unencrypted LDAP (389) to protect user credentials.

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