Unable to Start Debugging on the Web Server

I heard that a project was throwing this error on attempts to run it in a browser via Visual Studio. The full error complained about integrated Windows authentication.

What you need to do is go to the project via IIS and being up its properties. Then click over to the Directory Security tab, and under the first section, Anonymous access and authentication, there is an edit button. Click it, then down at the bottom you will see the checkbox for integrated Windows authentication. Check that box! Hit OK! And you should be all set.

Source: http://ryanfarley.com/blog/archive/2005/08/23/8540.aspx