Port 636 · LDAPS

Port 636 is LDAPS, TCP.

LDAP over TLS — encrypted directory queries. Preferred over plain LDAP for binds and sensitive attribute reads.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-636 protocol tcp port 636

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ldap service tcp-636 action allow

Risk and exposure

Rated low risk. Even so, only expose this port to the networks and hosts that need it, and keep it patched.

Check it

• Linux ss -tlnp | grep :636
• PowerShell Test-NetConnection <host> -Port 636
• nmap nmap -p 636 <host>

Related ports

• 389 LDAP
• 3268 AD Global Catalog
• 3269 AD Global Catalog SSL
• 88 Kerberos
• 464 Kerberos kpasswd
• 443 HTTPS

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