Port 3268 · AD Global Catalog

Port 3268 is AD Global Catalog, TCP.

Active Directory Global Catalog — cross-domain queries within a forest. Returns a partial attribute set.

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-3268 protocol tcp port 3268

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ldap service tcp-3268 action allow

Risk and exposure

Rated medium risk. Restrict this port to the sources that need it and keep the service patched; avoid exposing it to the whole internet unless the service is meant to be public.

Check it

• Linux ss -tlnp | grep :3268
• PowerShell Test-NetConnection <host> -Port 3268
• nmap nmap -p 3268 <host>

Related ports

• 3269 AD Global Catalog SSL
• 389 LDAP
• 636 LDAPS
• 88 Kerberos
• 464 Kerberos kpasswd
• 135 MS-RPC Endpoint Mapper

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