Port 631 · IPP / CUPS

Port 631 is IPP / CUPS, TCP and UDP.

Internet Printing Protocol — modern standard for network printing. Used by CUPS on Linux/macOS.

Palo Alto

Create the service objects 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-631 protocol tcp port 631
set service udp-631 protocol udp port 631

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ipp service [ tcp-631 udp-631 ] 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 :631
• Linux ss -ulnp | grep :631
• PowerShell Test-NetConnection <host> -Port 631
• nmap nmap -p 631 <host>
• nmap nmap -sU -p 631 <host>

Related ports

• 515 LPD / LPR
• 9100 JetDirect / Raw Print
• 445 SMB
• 3702 WS-Discovery

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