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

Security warning: what the checkbox really means is that the certificate can be read by users that shouldn't be able to read it. Such as the user running the IIS worker process. In production use the other answer instead.

Happened to me too, and was fixed by ensuring that "Allow this certificate to be exported" is checked when you import it:

                                           

(thanks to this post!)