A built in forwarding proxy is a networking component and as such can be installed within your network between your load balancer and your existing application servers (such as Microsoft IIS or Apache with PHP).
As a general rule, you should have one built in forwarding proxy for each application server in your network.
The built in forwarding proxy can co-exist on the same operating system as your existing application server, provided you configure non-conflicting ports and proper forwarding instructions in your server definitions.
The most important step in the configuration is to ensure that requests from the load balancer to the built in forwarding proxy are routed correctly. If your load balancer does not perform SSL termination, you will also be required to configure the built in forwarding proxy to correctly serve up your SSL certificate.
The process of creating and configuring a built in forwarding proxy involves a large number of steps and therefore have been relegated to its own section Creating a stand-alone built in forwarding proxy.