Are you receiving an endless "Validating Identity" connection status when trying to connect to a wireless network.
In a few simple steps you can bypass Windows Validation, and the resulting "Limited or No Connectivity" issue on an encrypted connection.
.header_background_full .header_background_slim .welcome-container .wlc-header .wlc-content .linksys-search-form .
Search Form #lia-body .linksys-search-form .lia-js-hidden #lia-body .linksys-search-form .search-input #lia-body .linksys-search-form .lia-search-form-wrapper .search-granularity #lia-body .linksys-search-form .lia-component-common-widget-search-form input.lia-button-search Form-action #lia-body .linksys-search-form .
This seemed to work for me after I disconnected from my router and reconnected again.
Now click on the Wireless Networks tab and select the network in the list at the bottom.
By default, XP will re-authenticate with the user credential after the user logs-on (there is no way to do computer-only with XP, I believe).
I'd start by reviewing the event logs on your IAS server for reasoning as to why it's not authenticating your client.
To fix, you go into the properties page of your wireless connection, go to "Wireless Networks" tab and then to Properties of the chosen wireless network you are trying to connect to.
Then go to "authentification" tab and untick the box saying "Enable IEEE802.1x to the availiable network" and that should solve your problem Graham UKRight, Graham's solution worked for me.