Web Server (IIS)\Web Serverrole has been added.
Web Server (IIS)/Web Server/Application Development/ISAPI Extensionsto the role.
For the Proxy Module with the authProxy:
The Proxy Module with authProxy machine will need to be added to Internet
Local Internet zone, so if you have a server already
listed there, you may want to use it.
This must be a separate machine from the Search Appliance, and the machine the Proxy Module is installed on must be a member of the Active Directory domain.
Ensure that the machine that the authProxy is being installed on is a secure machine. Because the Proxy Module is dealing with authorization functionality, a user with Administrative privileges could potentially tamper with operations.