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We have this problem with EAP-TLS with WPA and certificate authentication.
With a third part client (odissey) all work well, with integrated microsoft client all work if we deselect "Validate Server Certificate" into configuration.
In trusted server list there is our CA server.
But when we select this option (or if we try to connect to wifi network for the first time), authentication fail.
It's an annoying problem, because Windows XP default this option, so for an end user it's difficult to connect (he need to enter in network configuration.... we want a simple connection...).
Thank a lot
Try this link