Hi Ivan I managed to install the certificates on XP machine and works filn. I had configured my AP IP addresss in radius Server and shared secret key.yesterday i can get an Ip address when i click on the SSID today i get limited network connectivity. I hse VLAN 3 on the SSID. It was working well yesterday morning. Please could you let me know if i need to configure anything on my AP. Thanks My radius and AP are on the same subnet 203.121.4.x -- Devinder