IIS 7 Error “A specified logon session does not exist. It may already have been terminated.” when using https

Question

I am trying to create Client Certificates Authentication for my asp.net Website.

In order to create client certificates, I need to create a Certificate Authority first:<

Answer 1

In my case it was because the World Wide Publishing Service user didn't have permissions to the certificate. After installing the certificate, access the certificates module in MMC and right-click the certificate with the issue. Select "Manage Private Keys..." from the "All Tasks" menu and add the above user. This was SYSTEM user in my case.