title: Cannot start ASP.NET Core RC2 web application in IISExpress
body: <p>I created a new "ASP.NET Core Web Application (.NET Core)" project in VS2015. It built without any issues, so I thought to give it a test run. However, when starting up, it choked and crashed with the following error: </p>
  
  <pre><code>Exception thrown: 'System.AggregateException' in Microsoft.AspNetCore.Server.Kestrel.dll
  The program '[11608] dotnet.exe' has exited with code -1073741819 (0xc0000005) 'Access violation'.
  The program '[15048] iisexpress.exe' has exited with code 0 (0x0).
  </code></pre>
  
  <p>I don't see anything else logged. I tried debugging it, and all I found out was that it broke during the <code>WebHostBuilder.Run()</code> method in <code>Program</code> class. It is part of the framework, so I wasn't able to get much further.</p>
  
  <p>Note that the program runs fine when running via <code>dotnet run</code> command. Only IISExpress does not work.</p>
  
  <p>How should I go about debugging this issue? </p>
  
  <p>The project.json file is below. (It was generated by Visual Studio, I did not change anything.)</p>
  
  <pre><code>{
    "dependencies": {
      "Microsoft.NETCore.App": {
        "version": "1.0.0-rc2-3002702",
        "type": "platform"
      },
      "Microsoft.AspNetCore.Diagnostics": "1.0.0-rc2-final",
      "Microsoft.AspNetCore.Mvc": "1.0.0-rc2-final",
      "Microsoft.AspNetCore.Razor.Tools": {
        "version": "1.0.0-preview1-final",
        "type": "build"
      },
      "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-rc2-final",
      "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final",
      "Microsoft.AspNetCore.StaticFiles": "1.0.0-rc2-final",
      "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final",
      "Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final",
      "Microsoft.Extensions.Logging": "1.0.0-rc2-final",
      "Microsoft.Extensions.Logging.Console": "1.0.0-rc2-final",
      "Microsoft.Extensions.Logging.Debug": "1.0.0-rc2-final",
      "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc2-final"
    },
  
    "tools": {
      "Microsoft.AspNetCore.Razor.Tools": {
        "version": "1.0.0-preview1-final",
        "imports": "portable-net45+win8+dnxcore50"
      },
      "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
        "version": "1.0.0-preview1-final",
        "imports": "portable-net45+win8+dnxcore50"
      }
    },
  
    "frameworks": {
      "netcoreapp1.0": {
        "imports": [
          "dotnet5.6",
          "dnxcore50",
          "portable-net45+win8"
        ]
      }
    },
  
    "buildOptions": {
      "emitEntryPoint": true,
      "preserveCompilationContext": true
    },
  
    "runtimeOptions": {
      "gcServer": true
    },
  
    "publishOptions": {
      "include": [
        "wwwroot",
        "Views",
        "appsettings.json",
        "web.config"
      ]
    },
  
    "scripts": {
      "prepublish": [ "npm install", "bower install", "gulp clean", "gulp min" ],
      "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
    }
  }
  </code></pre>
  
  <hr>
  
  <p>Update: I created a new project for the Core RTM release, and this time it worked. </p>