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Unable to start process dotnet.exe.

After switching from IIS Express to IIS, I got into trouble when I tried to start the ASP.NET Core web application through Visual Studio.

When hitting F5, instead of building and launching my application, I got the following error message:

Unable to start process C:\Program Files\dotnet\dotnet.exe. The web server request failed with authentication failure 401, Unauthorized.

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Luckily sometimes error messages can be meaningful and enabling anonymous authentication in the launchSettings.json indeed solved the problem:

{

  "iisSettings": {

    "windowsAuthentication": false,

    "anonymousAuthentication": true,

    "iisExpress": {

      "applicationUrl": "http://localhost:53125",

      "sslPort": 0

}

  },

  "profiles": {

    "IIS Express": {

      "commandName": "IISExpress",

      "launchBrowser": true,

      "environmentVariables": {

        "ASPNETCORE_ENVIRONMENT": "local"

      }

    }

  }

}

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