A Windows proxy server is a computer that lets internal network users connect to one computer and use the computer’s Internet connection to browse websites. A proxy server is beneficial for network administrators that need to watch over bandwidth usage and website access. You can let your network users connect anonymously so that no user name and password are needed when using the proxy server connection. This is accomplished in the Internet Information Services (IIS) console.

How to Disable Authentication on a Proxy Server to Allow Anonymous Connections - 14