Port 1812 · RADIUS Auth

Port 1812 is RADIUS Auth, UDP.

RADIUS authentication and authorization — used for 802.1X wireless/wired NAC, VPN auth, and network device AAA.

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-1812 protocol udp port 1812

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application radius service udp-1812 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 :1812
• nmap nmap -sU -p 1812 <host>

Related ports

• 49 TACACS+
• 1813 RADIUS Accounting
• 88 Kerberos
• 500 IKE / ISAKMP
• 1194 OpenVPN
• 1701 L2TP

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