I have been strugling for a while trying to figure out a strange issue with a SSL certificate. The web site in concern runs on Oracle IAS and the SSL certificate is setup on oracle wallet manager. It was previously configured to use a self-signed certificate and it worked on all the browsers (IE, FireFox, Chrome, etc...). However, after setting up a VeriSign EV certificate the web site did not load on some Windows XP IE browsers (IE6, IE7 and IE8). All the other browsers did not have any problem loading the web site. My first guess was that it was an issue with Microsoft patches related to VerSign EV (Extended Validation) since the web site was loaded after installing all the windows patches on the PC's that had the issue. Yet, as the website was accessed by outsiders we had to find a solution that does not require any changes to client computers. Thanks to google, I found the below document which described the exact problem and the solution.