HP WebInspect Certificates and Authentication Time Out

I am having authentication issues when attempting to scan web applications behind a reverse web proxy. I can get to the site just fine on the system that runs that scanner but when I attempt to build my scan it times out and I never get prompted to choose my certificate (I am using CAC authentication).

What I would like to try is to load my certificate on the local machine. When I go to the default settings in WI I can see there is a selection for local machine and within that are two selections: "MY" and "ROOT" I can see there is a certificate for root but there is nothing for "MY"

How can I load my authentication certificate for there? I believe my time out issue is occurring because I am reaching across a VPN connection to my scanner and then through the WI program. Could this be the case?

I am open to any other suggestions as well.