We have been unable to reproduce NSSI's findings using the information they supplied. We communicated our inability to verify the test results to NSSI and continue to test possible scenarios. Bottom line: 1) The alleged behavior does not represent a security vulnerability. NSSI only alleges that under very limited circumstances involving a very heavy SYN flood with spoofed packets, a PC protected by ZoneAlarm Pro might slow down. 2) None of the alleged behavior would put user data at risk. 3) None of the alleged behavior would cause the protected PC to crash. 4) This attack scenario is unrealistic because according to NSSI, it requires that the attack comes from within a LAN behind a "10/100mbps switch". According to NSSI's report, once the attack stops, the PC functions normally once again. Under almost all circumstances, a common Internet connection (dial-up, cable or DSL connection) does not have enough bandwidth to trigger this inconvenience. We did find some slow-down on very fast networks and will address these issues in our next product release. 5) Our tests show that ZoneAlarm and ZoneAlarm Pro actually reduce the vulnerability to most DoS attacks significantly because our products prevent Windows from responding to this illegitimate traffic. 6) Neither ZoneAlarm nor ZoneAlarm Pro are designed to protect server platforms. The following supported platform list applies to both ZoneAlarm and ZoneAlarm Pro: http://www.zonelabs.com/store/content/support/znalmGeneralFAQ.jsp#9general <http://www.zonelabs.com/store/content/support/znalmGeneralFAQ.jsp> We appreciate NSSI's efforts to track this issue and are looking forward to working with them as we have in the past. Rgds, Te Te Smith Director, Corporate Communications Zone Labs Inc.