HKLM\SYSTEM\CurrentControlSet\Services\RemoteAccess\Accounting\Providers\{1AA7F840-C7F5-11D0-A376-00C04FC9DA04}\
The {1AA7F840-C7F5-11D0-A376-00C04FC9DA04}\Servers subkey stores server-specific configuration data for a RADIUS accounting provider .
This subkey does not contain any entries. It contains subkeys representing each RADIUS used for RADIUS accounting. The server-specific subkeys store entries that are configured separately for each server and apply only to the named server.
Note
RRAS add the Servers subkey to the registry when you add a server to the list in the RADIUS Accounting dialog box in Routing and Remote Access.
Tip
To configure a RRAS server to use RADIUS accounting, use Accounting Provider box on the Security tab in the Routing and Remote Access snap in.