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Asked: 2026-05-23T13:14:41+00:00

I’m deploying an MVC3 application to a new server. The application runs fine on

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I’m deploying an MVC3 application to a new server. The application runs fine on the development server (Visual Studio) and also under IIS7 on my development machine, but on the server I get a 403 error:

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I have completed the following steps, but am now out of ideas. Please help!

  • Using the same xcopy deployment technique that I used on my development machine, I have deployed files to the to the server and added the following permissions to the folder:

IUSR – Read & execute, List folder contents, Read
IIS_IUSRS – Read & execute, List folder contents, Read

  • I have also installed ASP.NET MVC3 on server so additional required .dlls are in GAC

  • IIS is set up and I can access basic html files (such as test.html that I have dropped in at the site route).

  • I have checked in Server Manager that all Role Services are installed

  • Have attempted to bin deploy by copying files from MVC install location and putting in the bin directory

C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies

C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies

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  1. Editorial Team

    Ok, found the problem. Here it is incase anyone else has the same issue:

    The Server I’m using must have had .NET 4 installed before IIS. This meant that .NET 4 hadn’t been registered with IIS.

    I noticed the issue when checking IIS config. Clicking the .NET compilation icon for the website threw an exception, presumably because the application could not be compiled.

    This led me to a stack overflow post that directed me to hanselman.com

    In short, I had to install VS2010 on the server so I had the Visual Studio command prompt available, and then register .NET 4 with IIS on the command line.

    IIS Manager can't configure .NET Compilation on .NET 4 Applications

    http://www.hanselman.com/blog/ASPNET4BreakingChangesAndStuffToBeAwareOf.aspx

    Key section:

    “I installed ASP.NET 4 and then
    installed IIS.”

    If you install VS2010 and/or .NET 4
    first, then later install IIS, you
    need make sure IIS is configured to
    know about ASP.NET 4 otherwise IIS
    will have no idea how to run ASP.NET 4
    applications.

    There’s a simple workaround

    If you are already in this state, drop
    to the command line and navigate to
    the FX install directory. Then run
    “aspnet_regiis –iru”.

    Note if you are on a 64-bit machine,
    run this command from the 64-bit FX
    install directory – not the 32-bit
    installation directory.

    or for future reference, try to enable
    IIS and the ASP.NET extensibility
    option first when your are building
    machines or VMs. That way when VS
    2010 or .NET are subsequently
    installed, the installation will
    automatically detect the presence of
    IIS and will auto-register with it.

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