Ever seen this error when debugging a web app in the VS.NET IDE: Error while trying to run project: Unable to start debugging on the web server. You do not have permissions to debug. Verify that you are a member of the 'Debugger Users' group on the sever. Well, search the net and you'll get 100s of hits talking about .NET debugging options, IIS configurations, permissions, admin access, etc.... In my case everything checked out and still no luck. Well here's another cause of this error: adding http://localhost...