INTERNET SECURITY FOR YOUR MACINTOSH"""""""" SHIPS AT MACWORLD/NY
""""""""A Guide for the Rest of Us"""""""" authored by key Open Door Networks employees

NEW YORK, NY. -- July 17, 2001 -- Open Door Networks Inc. today announced
availability of the first book dedicated to Macintosh Internet security,
""""""""Internet Security for Your Macintosh: A Guide for the Rest of Us"""""""". Written
by Alan Oppenheimer, Open Door's founder and president, and Charles
Whitaker, Open Door's lead technical writer, the book leverages Open Door's
five years as a Macintosh Internet security company to provide a
comprehensive but easy to understand guide for any Mac user who's connected
to the Internet. Published by Peachpit Press, the book is available at the
Peachpit booth (#855) at the MacWorld trade show, as well as at book
retailers nationwide.

""""""""We've learned a lot about what Mac users do and don't need to worry about
as far as security on the Net,"""""""" said Oppenheimer. """"""""We've also learned a lot
about how they want that security to be as simple and easy to understand as
the Macintosh itself. And we've learned that the increasing popularity of
broadband connections, and the availability of Mac OS X are creating a
whole new set of challenges. With 'Internet Security for Your Macintosh' we
hope to make what we've learned available to as wide an audience as
possible.""""""""

The book includes four main sections: """"""""General Security Principles,""""""""
""""""""Securing Internet Services,"""""""" """"""""Enhancing Overall Security"""""""" and """"""""Advanced
Topics."""""""" The """"""""Advanced Topics"""""""" section includes a chapter on securing Mac
OS X, which, being based on the Unix operating system, presents a number of
security issues that Mac users have not previously had to address. Chapters
are also included on Internet security at work and on AirPort (wireless)
networks. The book's Web site, http://www.peachpit.com/macsecurity/
includes a full table of contents, an excerpt, updates, and supplementary
materials. The retail price for the book is $19.99.

Open Door Networks, Inc. is a leading provider of Internet security
solutions for the Macintosh. Open Door was founded in January, 1995 by Alan
Oppenheimer, co-creator of the AppleTalk network system and co-author of
""""""""Inside AppleTalk."""""""" Open Door's mission is to provide Macintosh users with
Internet solutions that are as easy-to-use and as powerful as the Macintosh
itself. Open Door Networks is based in Ashland, Oregon.

----------------------------------

OPEN DOOR NETWORKS ANNOUNCES WHO'S THERE? FIREWALL ADVISOR FOR MAC OS X

NEW YORK, NY. -- July 17, 2001 -- Open Door Networks Inc. today announced a
Mac OS X specific version of its Who's There? Firewall Advisor. Who's
There? Firewall Advisor, shipping since January for Mac OS 8 and 9,
provides an important aspect of Internet security by helping users analyze,
investigate and respond to access attempts to their Macintosh. Who's There?
Firewall Advisor for Mac OS X is an OS X native version of the application
that provides analysis and advice specific to the Mac OS X environment.

""""""""Mac OS X's Unix base presents some interesting security challenges for Mac
users,"""""""" said Alan Oppenheimer, president of Open Door Networks and
co-author of the new book """"""""Internet Security for Your Macintosh: A Guide
for the Rest of Us"""""""". """"""""Who's There? Firewall Advisor for Mac OS X alerts
users to attacks that might not have been significant under previous
versions of the Mac OS, and provides them with advice and suggestions
specific to Mac OS X,"""""""" Oppenheimer continued.

With the ever-growing number of computers connected to the Internet through
""""""""always on"""""""" connections, there has been a significant increase in the
number of hackers attempting to infiltrate those computers. Personal
firewalls have been developed to thwart those attempts. As the number of
attempts has risen, however, users have become increasingly confused as to
the degree to which they should be concerned and what they can do in
response. Who's There? Firewall Advisor works with the user's firewall to
answer those questions.

Who's There? Firewall Advisor for Mac OS X works with Symantec's recently
announced Norton Personal Firewall for Mac OS X, which is based on
technology licensed from Open Door. Features of Who's There? Firewall
Advisor for Mac OS X include:

- Advanced Access History window displaying all logged access attempts and
including security risk level and host name of the accessor.

- Windows summarizing access attempts by service type and accessor IP address.

- Built-in information about the most common attacks and their
applicability specifically to the Mac OS X environment.

- Automated """"""""Whois"""""""" lookup to determine details of the accessor's network,
including administrator name, address, phone number and email.
Administrator's address plotted on a world map.

- Automated drafting of an email that can be used to notify the
administrator of the access attempt and provide the administrator with
details that may be useful in tracking the attempt.

Who's There? Firewall Advisor for Mac OS X should be available directly
from Open Door's Web site by the end of August. Registered users of Who's
There? can request the current beta release of the product, and will be
eligible for a special upgrade price. Other pricing details have not been
announced. Additional information on Who's There? is available off the
Who's There? Web site at http://www.opendoor.com/whosthere/.

Open Door Networks, Inc. is a leading provider of Internet security
solutions for the Macintosh, and the developer of Mac OS 9's TCP/IP File
Sharing feature. Open Door was founded in January, 1995 by Alan
Oppenheimer, an 11-year Apple veteran and co-creator of the AppleTalk
network system. Open Door's mission is to provide Macintosh users with
Internet solutions that are as easy-to-use and as powerful as the Macintosh
itself. Open Door Networks is based in Ashland, Oregon.