Is the certificate you're accessing one that you created yourself or did you create it through an authority?
Are you sure this is a proxy problem, and not based upon your certificate?
I get the same exact "company you have not chosen to trust" message, and certification path, whether accessing my site's https through proxy, or directly, simply because I created the certificate myself.
while your certificate is a self signed certificate (E.g. a certificate you created yourself) mine is created through an authority. However in both cases, our certificates fail because the certificate authority portion of the certificate is missing.
My certificate works when I connect to the virtual server directly. Connecting to your server (via the proxy) I can see that certificate is self generated but that the certificate authority (also www.kyoteproductions.com) is lacking.
If the certificate authority was in place your warning message would be different. It would read something like: the certificate was issued by an authority you don't know or thrust.