21.
ISA performs this type of securing through a SharePoint site publishing rule, which automatically
sets up and configures a listener on the ISA server. A listener is an ISA component
that listens to specifically defined IP traffic, and processes that traffic for the
requesting client as if it were the actual server itself. For example, a SharePoint listener on
an ISA server would respond to SharePoint HTTP requests made to it by scanning them for
exploits and then repackaging them and forwarding them on to the SharePoint server
itself. Using listeners, the client cannot tell the difference between the ISA server and the
SharePoint server itself.
FIGURE 14.20 Enabling SSL on an ISA listener.
403 Securing Access to SharePoint Sites with ISA 2006
ISA Server is also one of the few products that has the capability to secure web traffic with
SSL encryption from end to end. It does this by using the SharePoint server??™s own certificate
to re-encrypt the traffic before sending it on its way. This also allows for the ???black
box??? of SSL traffic to be examined for exploits and viruses at the Application layer, and
then re-encypted to reduce the chance of unauthorized viewing of the traffic.
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