IIS7: SSL Certificate binding issue

Problem

I recently tried installing a certificate into IIS7 on an new Windows 2008 server at work. The import went well but when I tried to bind a site to use the new certificate I got a dialog box with the following message

There was an error while performing this operation.

Details:A specified logon session does not exist. It may already have been terminated. (Exception from HRESULT: 0x80070520)

Solution

You have to check the "Allow this certificate to be exported" box when you import the certificate file to certificate store

Source

http://blog.freakcode.com/2009/02/iis7-certificate-binding-issue.html