If they discovered an incompatibility, they should have contacted Check Point to work out a temporary or permanent solution. Microsoft needed to test their update on computers with ZoneAlarm installed. Unless Check Point had prior access to the update, the blame rests with Microsoft. Firewalls are under frequent attack, and ingenious ways of selectively allowing or blocking network traffic enables ZoneAlarm to be effective. Many people are blaming ZoneAlarm for the problem, but I do not think it is their fault. ZoneAlarm is made to block suspect intrusions and extrusions. Once the update was installed, ZoneAlarm detected suspicious activity in the Windows XP kernel and disabled network traffic.
Microsoft's grade was based solely on its failure to test or detect compatibility problems with ZoneAlarm.
Unfortunately, this update does not work well with Check Point's ZoneAlarm, a widely used software firewall. Security Update for Windows XP (KB951748) addresses a serious problem and it should be installed. Upon installation, tens of thousands of users lost Internet connectivity. F is short for Fail, and Microsoft got a failing grade from me on its latest security update for Windows XP (KB951748).
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