I did not know this site had a secure version. I have always visited via regular http (ie: "http://www.orangetractortalks.com").
So I just attempted to access via secure https (ie:"https://www.orangetractortalks.com"), which is the only way a site certificate would be requested.
With Firefox, I get a secure connection failure with the error message "Error code: ssl_error_rx_record_too_long".
With Opera, I get "This site can't provide a secure connection.
www.orangetractortalks.com sent an invalid response."
With IE, I get "Internet Explorer cannot display the webpage" and one of the useless MS "Diagnose Connection Problem" links.
These errors suggest either there is no https -- in which case, there isn't a site certificate either -- or there's a configuration issue with port 443 and/or Apache on the server.
A DNS record search of orangetractortalks.com shows there is only an A record (http), no AAAA record (https). So the balance of probabilities is that the problem with the site certificate is that it does not exist, nor has it ever existed.