Port 1812
radius · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | radius |
| Reference | RFC 2865 |
Frequently asked questions
What is port 1812 used for?
Port 1812 is registered with the IANA for radius (TCP/UDP). Description: RADIUS.
Is port 1812 a well-known port?
No. Port 1812 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 1812 is open?
Locally on Linux with ss -tulpn | grep ':1812\b', on Windows with netstat -ano | findstr :1812. To test a remote host use Test-NetConnection <host> -Port 1812 in PowerShell or nc -zv <host> 1812 on Linux/macOS.
How do I open port 1812 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 1812/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1812/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1812" -Direction Inbound -Protocol TCP -LocalPort 1812 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | radius | RADIUS |
| UDP | radius | RADIUS |