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:
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.
PingBack from http://www.clickandsolve.com/?p=23119
Thanks, saved me a lot of hair pulling!