How To Tell What Files IE Thinks Are “nonsecure”?

Question

We have a CMS system whose web interface gets served over HTTPS. This works beautifully for Firefox, but when we load it in IE6 or IE7, it complains that \"This page contain

Answer 1

Use Fiddler to watch the traffic between the server and IE.

Be sure to go to Tools > Fiddler Options... > HTTPS > and check 'Decrypt HTTPS traffic'

Any non-HTTPS traffic generated between any server and IE should be easy to spot in the Web Sessions list.