This post contains the problem and solution. Background: Published a MVC application that includes the Authentication / Membership tools built-in to Microsoft's MVC Internet Template in VS 2012. So the web.config file was basically created from Microsoft's template. The app was running fine on my local server. Problem: Getting, when running off the Winhost server (one of the Windows 2012 servers, ASP.NET 4.5) the exception error, "Server Error in '/app' Application The Role Manager feature has not been enabled. Exception Details: System.Configuration.Provider.ProviderException: The Role Manager feature has not been enabled Solution: Add to the web.config the following: <appSettings> <add key="enableSimpleMembership" value="true" /> </appSettings> Hope this helps someone. Have a great day, CP