Can't access https: sites

[Simon]

When I try to access secure web pages IE6 tells me it
can't find them.

 

[H Leboeuf]

You Receive a "Page Cannot Be Displayed" Error Message When You Post to a
Site That Requires Authentication
Internet Explorer may not post data from a POST request and you may receive
a page cannot be displayed error message.
http://support.microsoft.com/?kbid=821814

Other issues on this page. Look for you exact error.
http://www.generation.net/~hleboeuf/canotofd.htm