Failed binding to socket

The FreeRADIUS server was unable to open a network socket on the specified port. The most common reason for this is that there’s another FreeRADIUS instance running in the background.

If you start the server in debug mode without stopping the current process, then the server port is already in use by the background process. The foreground process therefore cannot bind to the port. To resolve this issue, stop any running FreeRADIUS server before you start it in debug mode.

Another possibility is that the server doesn’t have the correct permissions (UID/GID) to open the socket. Security mechanisms like SeLinux can also block the server from accessing the port. To fix these issues, ensure the server has the correct permissions. Also, check your security settings to confirm that nothing is blocking the server from opening sockets on the configured IP address and port.