SSL is CPU consuming. Web server are usualy les powerull anf configured for file access and not running application. Have you try on another web server ? is you issue related to OWA. Do you know that there is third party card that assure SSL encryption and leave free the server CPU. another point that comes in mind is your routing table. Are you sure that the request for Certificate validation goes to the good adapter ? I have met this problem once... all requests were broadcasted to the external adapter and fall in time out... then the wright adapter was tried. Hope it can help Farice.