HKLM\SYSTEM\CurrentControlSet\Services\RemoteAccess\Authentication\Providers\
The {1AA7F83F-C7F5-11D0-A376-00C04FC9DA04} subkey stores configuration data for the RADIUS authentication provider.
This subkey also can contain a Servers subkey which, in turn, contains subkeys representing each RADIUS server used for RADIUS authentication. The server-specific subkeys store entries that apply only to the named server.
Tip
To configure a RRAS server to use RADIUS authentication, use Authentication Provider box on the Security tab in the Routing and Remote Access snap in.
Related Entries
(Windows authentication provider subkey) (RADIUS accounting provider subkey)