Port 1812: RADIUS
Port 1812 is RADIUS authentication, the protocol Wi-Fi networks, VPNs, and network switches use to check a username and password against a central server. RADIUS accounting, which logs session activity, uses port 1813.
UDPAuthenticationUnencrypted by defaultIANA assigned
| Port number | 1812 |
|---|---|
| Service | RADIUS authentication |
| Protocol | UDP |
| Category | Authentication |
| Default encryption | No |
Security note. Port 1812 is not encrypted by default. Restrict it to trusted networks, or use an encrypted alternative where one exists, to avoid exposing credentials and data in transit.
Frequently asked questions
What is port 1812 used for?
Port 1812 is RADIUS authentication, the protocol Wi-Fi networks, VPNs, and network switches use to check a username and password against a central server. RADIUS accounting, which logs session activity, uses port 1813.
Is port 1812 TCP or UDP?
Port 1812 (RADIUS) uses UDP.
Is port 1812 secure?
Port 1812 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 1812 on my firewall?
Only if you specifically need RADIUS. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.