Port 623 · IPMI / RMCP

Port 623 is IPMI / RMCP, UDP.

Intelligent Platform Management Interface — out-of-band server management (iDRAC, iLO, BMC). Historically has had critical vulnerabilities.

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 udp-623 protocol udp port 623

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ipmi-rmcp service udp-623 action allow

Risk and exposure

Rated high risk. Services on this port are commonly targeted by attackers. Keep it off the internet, or put it behind a VPN or a strict source allow-list, and monitor access.

Check it

• Linux ss -ulnp | grep :623
• nmap nmap -sU -p 623 <host>

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