Radius Server can be enabled to allow 802.1x wireless access points to perform RADIUS authentication of wireless users defined in list of Local Directory users.
To use RADIUS authentication, you will need to consult the documentation for your wireless access point to determine how to enable Network Authentication using RADIUS. When enabling that feature, somewhere in the settings you will have to input the authentication server details. The IP Address will be the IP address of your Untangle server on the same LAN segment as your wireless access point. The RADIUS port number is 1812. The Shared Secret will be the value you configure on the RADIUS Server configuration tab.