Port 500 · IKE / ISAKMP

Port 500 is IKE / ISAKMP, UDP.

Internet Key Exchange — IPSec VPN phase 1 negotiation. Establishes the security association before data flows.

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-500 protocol udp port 500

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ike service udp-500 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 -ulnp | grep :500
• nmap nmap -sU -p 500 <host>

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