Wireless validating identiy
When I try to connect using the windows zero configuration utility it gets stuck validating identity.
After checking various forums, advice was to unclick the 'enable IEEE 802.1 authentication box in the router properties.
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.
The weird part is that I was using WPA TKIP with the passphrase and it was working fine.
I moved the selection tab to WPA2 only and keep the rest the same and no luck. Ok so I setup the router to only transmit wireless N and to use WPA2 only.