I added an ASP.NET MVC3 site to ISS (which was working fine in the debugger). When viewing the site in a browser, everything appeared to be working fine except that all of the CSS and JS files were returning a 404.

Here is the site in IIS Manager:

Other details:

  • OS: Windows Vista Home Premium 32-bit (with SP2)
  • IIS: 7.0.6000.16386
  • Visual Studio 2010 Express with SP1

1 Answer 1


It sounds like a permissions error. Did you remember to add the IIS User IIS_IUSRS to the list of users that can access the files?

  • Woops... I gave IIS_IUSRS full access to the folder and it's working now. Apr 18, 2011 at 1:28
  • 3
    How to set it up in IIS Express? and how come there is no IIS_IUSRS in my computer?
    – Blaise
    Jul 21, 2014 at 20:46
  • Like @Blaise I'd like to know how to manage IIS users with IIS Express.
    – Antoine
    Apr 1, 2015 at 14:32

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