IIS 7 Not Serving Default Document

Question

We have a problem occuring on some of our developer workstations: when visiting a URL without a filename (e.g. http://localhost/), IIS 7 returns a 404 error

Answer 1

It looks like Microsoft released an update that enables the ExtensionlessURL HTTP handler to work with extensionless URLs. Unfortunately, this breaks certain other handlers. In my case, the DefaultDocument handler under classic app pools. The solution is to remove the ExtensionlessURL handlers in our application's web.config: