Im on the D-Link DIR-655Wireless Router and im using XP PRO SP2 if that helps.So basically, I keep getting an error when i try to connect to my own network "VALIDATING IDENTITY Windows was unable to find a certificant to log you on to the the network" I entered the correct network key that was setup with the router and im really frustrated because i tried everything in the options and nothing works.In order to configure the connection back to Automatic, edit the eduroam profile, go to the Connection tab and check Connect when this network is in range: Figure 14: Setting Automatic connection  = If the Wireless Network Connection icon is not present, this may be due to the wireless network manager of your vendor's card taking over from Windows' built-in one (Wireless Zero Configuration).Please refer to the documentation of your vendor's card in order to turn it off as this may interfere with the procedure here documented.
then I'd troubleshoot the wireless by doing the following: 1) Make sure that the MAC address of the wireless NIC card is in the "accepted" list on the router.
 = If the eduroam network does not show up, click on Refresh network list.
Are you receiving an endless "Validating Identity" connection status when trying to connect to a wireless network.
WPA2 is supported as i can connect to WPA2 personal APs. During the connection it flashes that it "connected" for a second then goes to "Validating Identity" which it eventually timesout on.
I am using the Windows Wireless Connection Manager. On a couple of occasions I've seen that particular AP (don't know what firmware) suddenly stop attempting to authnenticate clients (it never sends any RADIUS requests) and power-cycling the AP "fixes" the issue.
In a few simple steps you can bypass Windows Validation, and the resulting "Limited or No Connectivity" issue on an encrypted connection.