Configurazione IIS 7 come proxy

Prima occorre installare l'application Request Routing:
http://www.iis.net/learn/extensions/installing-application-request-routing-%28arr%29/install-application-request-routing

Poi seguire gli step qui: 
http://www.iis.net/learn/extensions/url-rewrite-module/reverse-proxy-with-url-rewrite-v2-and-application-request-routing