NoteHKLM\SYSTEM\CurrentControlSet\Services\RemoteAccess\Authentication\Providers\{1AA7F83F-C7F5-11D0-A376-00C04FC9DA04}\Servers\
The <Server-name> subkey stores server-specific configuration data for a RADIUS authentication provider.
The <Server-name> subkey is a variable representing the subkeys in the RemoteAccess\Authentication\{1AA7F83F-C7F5-11D0-A376-00C04FC9DA04}\Servers subkey. It doesn't actually appear in the registry. We use this variable subkey to display the entries and subkeys that are common to the subkeys in the Servers subkey.
The <Server-name> subkeys in your registry represent RADIUS servers that are used for RADIUS authentication. Each subkey represents a particular server and stores configuration data that applies only to that server.
Note
RRAS adds the Servers subkey to the registry when you add a server to the list in the RADIUS Authentication dialog box in Routing and Remote Access.
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.