Any chance of posting the application config data to change it to use Kerberos, I can't seem to find i on the documentation and fancy having a crack at it without having to type everything.
I noticed too mine had SSL tag on it but on your vid yours doesn't, I take it I need to keep this.
<location path="Default Web Site/HAP">
<anonymousAuthentication userName="" />
<access sslFlags="Ssl, SslNegotiateCert" />