Publishing and Customizing SharePoint Web Server Publishing Rules
The key to ISA's HTTP filtering functionality revolves around the web server publishing rule. This type of rule allows an ISA Server to “pretend” to be the SharePoint server itself, while secretly passing the packets back to the server via a separate process. This has the added advantage of securing the traffic by not directly exposing the SharePoint web servers from direct attack and forcing them to overcome the ISA server before they can overcome the SharePoint server.
NOTE
Unlike with other types of server publishing rules, ISA does not need to be installed as a multi homed (multiple NICs) server to take advantage of web publishing rules. Instead, ISA allows for the creation ...
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