windows internet explorer and https problem

In Internet Explorer you see "Certificate Error: Navigation Blocked": as usual, when visiting sites with self signed certificates or unknown CA.
When pressing the continue to site not recommended blabla button, nothing changes, it just stays on the same page.

So, there is a windows upgrade, KB2661254 (Microsoft Security Advisory: Update for minimum certificate key length) released on 9 October (I think), that prevent access to some https web sites using Internet Explorer.

And Internet Explorer don't say anything. Simply, if you click on Proceed anyway, nothing happens.

So, you must upgrade your web servers to 1024 or 2048 bit keys, or uninstall such windows upgrade, or make changes in the windows registry to lower the minimum certificate key length (search the KB article on the Microsoft site).


Some info http://ssl.entrust.net/blog/?p=1208