Port 1521 · Oracle DB

Port 1521 is Oracle DB, TCP.

Oracle Database TNS listener — default port for client connections.

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-1521 protocol tcp port 1521

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application oracle-db service tcp-1521 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 :1521
• PowerShell Test-NetConnection <host> -Port 1521
• nmap nmap -p 1521 <host>

Related ports

• 7001 WebLogic HTTP
• 7443 WebLogic HTTPS

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