Configure Remote RADIUS Server Groups setting 

1. In NPS, open the RADIUS Client and Servers menu in the left panel, and select "Remote RADIUS Server Groups".
2. Select "TS GATEWAY SERVER GROUP" in the middle panel. 
   
   
   
   
3. Right click the "Properties" in "TS GATEWAY SERVER GROUP", and click "Add". 
   
   
   
   
4. In "Address"  tab, add the DualShield RADIUS Server's address.
   
   
   
   
5. In "Authentication/Accounting" tab, create a shared secret key. 
   
   
   
   
6. Change both the Number of seconds without response before request is considered dropped and the Number of seconds between requests when server is identified as unavailable to between 30 and 60 seconds. 
   (If you find that the server still times out during authentication, you can come back here and increase the number of seconds.)