This fi lter is one of the more important in the set as it will be most
used. Although many people will not be interested in proxying or perhaps even allowing
the H.323 protocol for multimedia content, almost everyone using ISA Server will
want to proxy traffi c to the web. To do this, you need to use the Web Proxy Filter.
The Web Filters tab shows a set of fi lters that are actually Internet Server
Application Program Interface (ISAPI) plug-ins to the Web Proxy Filter. In other
words, these are all dependent on the Web Proxy Filter, and allow for the tweaking
of some functionality of this fi lter.
398 Chapter 11 ??? Confi guring Microsoft Internet Security and Acceleration Server 2006
The trick to understanding these filters is to know that the configuration
of these filters is not actually done in this area. The only thing you can do
under this node is to enable and disable filters. Configuring settings for these is
done throughout the rest of the ISA Server Management Console interface. For
example, under Configuration | Add-ins | Web Filters you can enable or
disable the Caching Compressed Content Filter. However, in order to set
what or how much compressed content can be cached by the web proxy, you
need to go to Configuration | General | Define HTTP Compression
Preferences.
One fi nal note needs to be provided on these fi lters. In environments where there
is a lot of traffi c, and system resources on the ISA Server Firewall need to be conserved,
administrators should look to disable any fi lters not in use.
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