said by kelvin :

Your ZoneAlarm is an old version. The latest version should be 7.x

said by Inkognito :

I had the same issue with that MS update and Zonealarm. I tried all solutions, and only thing I could do to get my Internet back was to uninstall the update. Well done MS.

said by winchester73 :

For those of you using ZoneAlarm who installed the windows updates today, you probably already know that your internet connection has died. It appears that KB951748 made changes to the networking files that ZA doesn't see/recognize.

After two hours of messing around, I found an inelegant solution that will work temporarily ... set the Internet Zone Security permission slider from high to medium. The connection will be restored.

I discovered this after I finally figured out ZA was blocking my internet connections, and turned it off. Once everything worked again as normal, I started playing around and hit on this lowered permission setting.

I imagine the ZA forum will be full of better solutions, but thought this would get you back up and running in the short term.

said by w8sdz :

Do not uninstall the KB951748 update. It's VERY important.

Fixes Released for Massive Internet Security Issue

On July 8th, technology vendors from across the industry will simultaneously release patches for their products to close a major vulnerability in the underpinnings of the Internet. While most home users will be automatically updated, it’s important for all businesses to immediately update their networks. This is the largest synchronized security update in the history of the Internet, and is the result of hard work and dedication across dozens of organizations.

Details here:

»securosis.com/2008/07/08/dan-kam···eleased/

It's far better to run ZoneAlarm in the Medium setting because the DNS poisoning issue can cause your browser to be sent to bad sites.

said by gugarci :

To play it safe I've chosen to hide that update. Don't want my wife to accidentally install it. Eventhough I have a sticky by the PC with a "DO NOT INSTALL KB951748".

said by La Luna :

To solve this, just reset the ZA database and the ZA will be "fresh" as when it was first installed

said by La Luna :

This is the vague explanation:

If the windows update changed the usual needed files for networking/internet, then the ZA will not see the changes and continue to use the previously known files and ignore the newer files. Even though the file names and locations are still the same from before, now the file size and checksums no longer match.