At last, Visual Studio patch for F5 debugging on Windows Vista has been released

A Visual Studio patch that fixes the Visual Studio F5 debugging of IIS7 applications on Windows Vista Home Premium and above has been released! 

This patch solves the "An authentication error occurred while communicating with the web server.  Please see Help for assistance.", and "Debugging failed because integrated Windows authentication is not enabled.  Please see Help for assistance" errors, that until now had to be worked around using the instructions in my previous post on this matter.

For more information and download link, see my older post Fix problems with Visual Studio F5 debugging of ASP.NET applications on IIS7 Vista.




  1. Anonymous

    If we are not having any problems, should we still install this hotfix? How does this hotfix fix the issue? Does it simply change the application pool and enable Windows Authentication?


  2. Mike Volodarsky


    Only install this hotfix if you are having the problems described above. The hotfix works around the runtime System.Web.dll issues on Vista, and the lack of Windows Authentication module on Vista Home Premium, by employing an alternate attach mechanism that doesnt require Windows Authentication or the System.Web.dll attach logic.

    The System.Web.dll issues will be fixed in Vista SP1 / LHS. Visual Studio Orcas will include the alternate mechansim for for Vista Home Premium.



  3. Anonymous

    כל הפרטים אצל Mike Volodarsky’s ServerSide ב: At last, Visual Studio patch for F5 debugging on Windows

  4. Anonymous

    Hi Mike,

    I am facing the same problem but with VS 2008 on Home Premium Vista. Does this Hotfix solves the problem of VS 2008 too.

    Thanks in Advance,
    Amit Chadha

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