Port 515 · LPD / LPR

Port 515 is LPD / LPR, TCP.

Line Printer Daemon — legacy Unix printing protocol, still used by many network printers.

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-515 protocol tcp port 515

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application lpd service tcp-515 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 :515
• PowerShell Test-NetConnection <host> -Port 515
• nmap nmap -p 515 <host>

Related ports

• 631 IPP / CUPS
• 9100 JetDirect / Raw Print
• 445 SMB
• 3702 WS-Discovery

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