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ISA Server 2004 Configuration Guide 3
Learn about ISA Server 2004 features
ISA Server 2004 is designed to protect your network from intruders located on the inside of
your network and those outside of your network. The ISA Server 2004 firewall does this by
controlling what communications can pass through the firewall. The basic concept is simple: if
the firewall has a rule that allows the communication through the firewall, then it is passed
through. If there is no rule that allows the communication, or if there is a rule that explicitly
denies the connection, then the communication is stopped by the firewall.
The ISA Server 2004 firewall contains dozens of features you can use to provide secure
access to the Internet and secure access to resources on your network from machines
located on the Internet. While this Guide can’t provide comprehensive step-by-steps for all the
possible features included with ISA Server 2004, we have provided for you a number of step-
by-step walkthroughs that will allow you to learn how the most common, and most popular,
features of the ISA Server 2004 work.
Firewalls do not work in a vacuum. There are a number of networking services required to
assist the firewall protect your network. This guide provides you with detailed information on
how to install and configure these services. It’s critical that the network is set up properly
before you install and configure the firewall. Proper network service support will help you
avoid the most common problems seen in ISA Server 2004 firewall deployments.
This guide will walk you through setup and configuration of the following network services and
ISA Server 2004 firewall features:
• Install and configure Microsoft Certificate Services
• Install and configure Microsoft Internet Authentication Services (RADIUS)
• Install and configure the Microsoft DHCP and WINS Services
• Configure WPAD entries in DNS to support autodiscovery and autoconfiguration of Web
Proxy and Firewall clients
• Install the Microsoft DNS server on a perimeter network server
• Install the ISA Server 2004 firewall software
• Back up and restore the ISA Server 2004 firewall configuration
• Use ISA Server 2004 Network Templates to configure the firewall
• Configure ISA Server 2004 clients
• Create Access Policy on the ISA Server 2004 firewall
• Publish a Web Server on a Perimeter network
• Use the ISA Server 2004 firewall as a spam filtering SMTP relay
• Publish Microsoft Exchange Server services
• Make the ISA Server 2004 firewall into a VPN server
• Create a site to site VPN connection between two networks