Cisco PIX 500 Series Security Appliances

Field Notice: PIX Firewall 4.2(1) Deferral

July 17, 1998

Products Affected

All PIX Firewall platforms (PIX, PIX10000, PIX-510, and PIX-520) on which PIX Firewall 4.2(1) software is installed are affected by this deferral. Both PIX Firewall and PIX Firewall Manager software are being deferred due to the interdependence between these two products, even though the defects listed below are only present in the PIX Firewall software itself.

Problem Description

This field notice describes several software defects that have been reported against PIX Firewall 4.2(1) that could result in unpredictable failures, including system reloads. As a result, the image has been deferred.

Bug Information

If you are a registered CCO user and you have logged in, you can view bug details.


PIX Firewall 4.2(1) software was released to Cisco Connection Online (CCO) on June 17, 1998. Version 4.2(1) was never included as part of any hardware released by Cisco or made available on CD-ROM. Only customers who actively downloaded 4.2(1) from CCO are affected by this Field Notice.


Cisco recommends using PIX Firewall 4.1 images until 4.2(2) is released.


To eliminate the problems described in this notice, we recommend that you download and install PIX Firewall 4.2(2) when it becomes available.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods: