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Microsoft ISA Server Offers Secure Remote Host Access for PASSPORT Terminal Emulation


Microsoft® Internet Security and Acceleration (ISA) Server 2004 offers the ability to allow terminal emulation sessions to access host systems using TCP port 80 instead of TCP port 23. Also, internal and external users can be restricted as to which internal or external resources they can access. By incorporating TN3270, TN5250, VT100, VT220 and SCO ANSI host access through an ISA Server, organizations running PASSPORT WEB TO HOST™ can use TCP port 80 for both HTTP and Telnet traffic. PASSPORT WEB TO HOST terminal emulation software provides browser-based host access to IBM zSeries (3270), IBM iSeries (5250) and UNIX (Telnet) host systems.


There are two technical benefits to running PASSPORT WEB TO HOST terminal emulation software through an ISA Server.

TCP Port Redirection – Many corporate security policies only allow network traffic through firewalls on TCP port 80. The ISA server can be configured to allow Telnet traffic over TCP port 80 and then redirect the Telnet data to TCP port 23. PASSPORT WEB TO HOST terminal emulation sessions can now be established using TCP port 80 without compromising security.
Increased Security – By using ISA Server, network managers can restrict which users have access to terminal emulation sessions. Restrictions can be placed on external users accessing internal resources, and also restrictions can be placed on internal users accessing external resources. These resources include the mainframe host system and/or the PASSPORT WEB TO HOST server.

Microsoft Internet Security and Acceleration Server 2004 is the advanced application-layer firewall, VPN, and Web cache solution that enables customers to easily maximize existing IT investments by improving network security and performance. A member of the Microsoft Windows Server System™, ISA Server is a secure, easy-to-use, cost-effective solution that helps IT professionals combat new and emerging security threats..

If your organization requires remote access to host applications through TCP port 80, PASSPORT WEB TO HOST with Microsoft® ISA Server should be considered as a viable solution. If you would like to receive a technical application note with complete technical details on how to use and configure ISA server with PASSPORT WEB TO HOST, contact Zephyr technical support at

About Zephyr

Zephyr Development Corporation is committed to delivering high-quality, affordable TN3270, TN5250, VT100, VT220 and SCO ANSI terminal emulation software and host access solutions. Zephyr offers subscription based licensing that substantially reduces the cost of terminal emulation software. Founded in 1985, Zephyr is a Citrix Premier Alliance Partner, a Cisco Enterprise Associate, a member of IBM® PartnerWorld, Microsoft® MSDN and the IETF. Zephyr headquarters are in Houston , Texas and can be accessed on the web at

About Microsoft

Founded in 1975, Microsoft is the worldwide leader in software, services and solutions that help people and businesses realize their full potential . Microsoft headquarters are in Redmond, Washington and can be accessed on the web at


Zephyr, PASSPORT and PASSPORT WEB TO HOST are trademarks of Zephyr Development Corporation. Microsoft, Windows and Windows Server are registered trademarks of Microsoft. All other trademarks and trade names are the property of their respective owners.


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