Got this error again and again, always takes about half hour to remember that it's the IIS missing "Url rewrite" module!

HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information: Module IIS Web Core Notification Unknown Handler Not yet determined Error Code 0x8007000d Config Error
Config File \?\X:\kb\web.config Requested URL http://kb/ Physical Path
Logon Method Not yet determined Logon User Not yet determined