Port 636 supports LDAPS and ldaps (UDP reference coverage) across distinct transports. Review each protocol before writing firewall or monitoring policy.
LDAP directory traffic protected by implicit TLS.
Encrypted directory queries and binds, particularly for Active Directory integrations.
Client to server
Validate the directory server certificate and hostname; encrypted transport does not replace bind and authorization controls.
ldaps (UDP reference coverage) is documented as a network service convention for port 636 over UDP.
Use this reference entry when identifying or validating systems documented to use 636/UDP.
Varies
Confirm the listening process and current vendor documentation before permitting traffic; a listed convention does not prove the active service or its security posture.