I tried using NTRadPing Test Utility, entering the Radius Server IP/Port, Shared Secret,User-Name,Password, Request Type: Authentication Request.
For Additional RADIUS Attribute: I added NAS-IP Address: (The client IP address ) . NTRadPing was able to authenticate with RADIUS Server successfully.
Now, in SSL VPN SA 4500, I created a realm which uses Radius Authentication, and in NAS IP Address, I entered IP Address for Internal port. However , it is not successful. I left NAS IP Address empty, it was not successful.
The Radius server verifies the IP Address of the client