APR-2000/APR-2000P User’s Manual- 25 -Wireless Security Type-WPA/WPA2 Screen1. Security Type: Select WPA/WPA22. Auth Mode: Choose one of three Auth Modes: WPA, WPA2, WPA/WPA2 mix.3. Encryption Type: Choose one of three Encryption Types: TKIP, AES, TKIP/AES mix.4. Radius Server IP: Enter the IP address of the RADIUS Server.5. Port: Enter the RADIUS port (1812 is default).6. Shared Secret: Enter the RADIUS password or key.RADIUS, or Remote Authentication Dial-In User Service, is a widely deployed protocolthat enables companies to authenticate, authorize and account for remote users who wantaccess to a system or service from a central network server.Radius server validates your proof, also carry on the authorization. So the Radius serverreceived by ISA server responded (point out the customer carries proof to be not granted) andit means that the Radius server did not authorize you to carry. Even if the proof has alreadypassed an identify verification, the ISA server may also refuse you to carry a claim according tothe authorization strategy of the Radius server.The principle of the Radius server is shown in the following pictures: