DoorStop Server Edition is a software-based "firewall" product for Macintosh servers. Unlike conventional firewalls, which are usually expensive dedicated hardware devices, DoorStop is software which you install directly on the servers which you wish to protect. DoorStop is significantly easier to set up and use than a hardware firewall and provides much of the same capabilities at significantly lower cost. With DoorStop, you can specify precisely which machines should have access to which services, and you can keep track of both allowed and denied access attempts to those services. DoorStop works well with a wide range of Macintosh-based Internet servers, including AppleShare IP, WebSTAR, and Open Door's ShareWay IP product line. DoorStop is also available in a Personal Edition, which is intended for use with personal machines.

DoorStop is available in two editions:

• DoorStop Server Edition has been specifically designed for servers, such as AppleShare IP, ShareWay IP Pro, and WebSTAR.
• DoorStop Personal Edition is specifically designed for end-user machines, especially those on intranets or full-time connections such as cable modems and ADSL. Personal Edition has also been designed to protect Mac OS 9's new Internet features, with unparalleled ease of use. Also runs back to Mac OS 8.1.

This User's Guide provides details of the Server Edition of DoorStop. A separate User's Guide is available for the Personal Edition.

Table of Contents

Getting Started	System Requirements Installation Quick Start
DoorStop Basics	What DoorStop Does The DoorStop Model Specifying Filters Filters on Machines with Multiple IP Addresses DoorStop's Algorithm
Using DoorStop	Working With Filters Finding IP Addresses Checking Client Access Activating DoorStop Changing the DoorStop Machine's IP Address Exporting Filters Logging Serial Numbers DoorStop Defaults What Clients Will See
Troubleshooting	Common Problems & Their Solutions
Appendixes	Port Numbers Using DoorStop with ShareWay IP Pro Using DoorStop with AppleShare IP Replacing AppleShare IP's TCP Filter Application Using DoorStop with WebSTAR 3.0 DoorStop and LogDoor 2.2 DoorStop Log File Format DoorStop & Mac OS 9