Port 514 · Syslog

Port 514 is Syslog, TCP and UDP.

Syslog — network devices stream log messages to a central collector. UDP is fire-and-forget; TCP adds delivery guarantees.

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-514 protocol tcp port 514
set service udp-514 protocol udp port 514

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application syslog service [ tcp-514 udp-514 ] 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 :514
• Linux ss -ulnp | grep :514
• PowerShell Test-NetConnection <host> -Port 514
• nmap nmap -p 514 <host>
• nmap nmap -sU -p 514 <host>

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