ASP.NET Development Server (“Cassini”) Stops Working

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If you are suddenly unable to debug ASP.NET apps using the ASP.NET Development Server (aka “Cassini”), check your hosts file and make sure there’s an entry:

 127.0.0.1    localhost

There was an update on March 9, 2009 that might have removed this entry from the hosts file.  For more information, see the Visual Web Developer team blog.