Microsoft Update + ZoneAlarm = No Internet Access
With the last Microsoft patch this past Tuesday, if you were a user of ZoneAlarm, you were no longer able to access the Internet. I happen to be one of those users. I could get to my router, but not the Internet. Other devices on my network, of course, also were able to access the Internet. When I finally discovered that ZoneAlarm was the problem, I found a reference on the ZoneAlarm site. Apparently the patch was fixing quite a serious flaw in Internet addressing.
"You'd have the Internet, but it wouldn't be the Internet you expect. (Hackers) would control everything."I find it funny that fixing the flaw caused ZoneAlarm problems. Anyway, if you're finding this post, then you were not affected or you have solved the problem.
- Securosis analyst Rich Mogul
Check Point (ZoneAlarm team)