Microsoft Knowledge Base Article 813444 contains the following INTRODUCTION:
This article describes how to troubleshoot situations where you cannot connect to SSL Secured (128-Bit) Web sites
(https://) by using Microsoft Internet Explorer in Windows XP.
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To troubleshoot situations where you cannot connect to SSL Secured (128-Bit) Web sites by using Internet Explorer, use the following methods in the order that they are presented. After each method, use Internet Explorer to try to connect to a SSL Secured (128-Bit) Web site and determine if the problem is resolved. If you can connect to the SSL Secured (128-Bit) Web site, you do not have to use the following methods. If the problem is not resolved, go to the next method.