Port 636 — LDAPS

TCP · Port 636/TCP is used for the secure Lightweight Directory Access Protocol (LDAP) service, LDAPS. This protocol provides a secure way to access and manage directory information over TCP/IP networks. LDAPS uses Transport Layer Security (TLS) or Secure Sockets Layer (SSL) for encryption.

Port Number: 636
Service Name: LDAPS
Protocol: TCP
Common Software: OpenLDAP, Active Directory

Security Notes

Review IANA registry for port 636 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 636 used for?

Port 636 is used for LDAPS. Port 636/TCP is used for the secure Lightweight Directory Access Protocol (LDAP) service, LDAPS. This protocol provides a secure way to access and manage directory information over TCP/IP networks. LDAPS uses Transport Layer Security (TLS) or Secure Sockets Layer (SSL) for encryption. Common software: OpenLDAP, Active Directory.

Is port 636 dangerous to leave open?

Review IANA registry for port 636 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 636 is open?

Use nmap: nmap -p 636 <target> or check locally: ss -tlnp | rg 636