you can check out the following options :
1. On client side enable LEAP.
when u enable LEAP, Data Encryption changes to DYnamic WEP and set Access Point authentication to open.
2.On AP.
Enable accept Authentication type to Network EAP.Also check out the Use of Data Encryption by station to Full Encryption.
Configure Raduis IP address and Port on AP.
you need to configure Shared key also.
TACACs+ use port no. 1645.
3.On Radius server configure AP ip address and Shared Key.
