Setting up a new Windows 2008 x64 Server and loading updates on a customer’s Vista notebook. Having updates fail on the server with an 802002b error stating “Windows Update encountered an unknown error” on the 2008 box. I have also been having an IE 7 update failing consistently on our SBS 2003 box. Decided to try turning off the Web monitoring/filtering our office’s Calyptix AE1000. All updates completed without any trouble. I like the Calyptix, but if you are running into similar errors, either on Calyptix, or other firewalls for that matter, try turning off the monitoring / outbound filtering.