Port 4501 · GlobalProtect IPSec

Port 4501 is GlobalProtect IPSec, UDP.

Palo Alto GlobalProtect — IPSec/ESP tunnel port. Preferred over SSL tunnel for better throughput.

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-4501 protocol udp port 4501

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application globalprotect service udp-4501 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 :4501
• nmap nmap -sU -p 4501 <host>

Related ports

• 4443 GlobalProtect HTTPS
• 500 IKE / ISAKMP
• 1701 L2TP
• 4500 IPSec NAT Traversal
• 443 HTTPS
• 22 SSH

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