http://stackoverflow.com/questions/22199424/there-was-an-error-while-performing-this-operation Browsing to the site results in a 500 error, and nothing is logged to the windows event log. Adding 'everyone full control' permission does not resolve the issue, ruling out a permissions problem. In IIS, going to some of the config areas of the site (e.g. modules) results in a nondescript "There was an error while performing this operation" with the path to web.config and no other details. These symptoms occur when a site is using the URL Rewrite module -- install it via Microsoft's Web Platform Installer, then restart IIS.