The most common cause of this error is not having a PEAP certificate installed in RadiusNT/X. A PEAP certificate must be configured in the EAP section of the RadiusNT/X administrator.
For more information on PEAP certificates please see our '802.1x/EAP Authentication Guide' avaliable from the documentation section of the web site: http://www.iea-software.com/docs#radius
