Cannot Authenticate User on Web Site that Has Worked for Years

Windows Server 2008 R2.  IIS 7.x.  Visual Developer 2013 Ultimate.
(Edited:  isn't there a configuration window you use in VS when you set up a web site that tells VS how to authenticate?  How do I get to that in VS 2013?)
I am in the process of updating a web site that has been running fine for years.  I have no problem debugging it in Visual Studio 2012.  I just moved it into VS2013 and upgraded to .NET framework 4.x from .NET Framework 2.0.  In the process, I rebuilt the Web.config file, trying to maintain the authentication settings from the old site.  I have included the Web.config below.  I get an "Access denied" error page when I try to display (from VS2013) the Default.aspx file.  The error is as follows:
Server Error in '/' Application. Access is denied.             ...