Unable to debug ASP.NET 5 using IIS Express with Visual Studio 2015

Question

When I am trying to debug asp.net 5 application in Visual Studio 2015, I am getting following error "An error occurred attempting to determine the process id of the DNX process hosting your application"

UPDATE 2

It is only happening in Windows 10. I tested with Windows 7 and I did not run into this error.

I am able to run using "web" option in Visual Studio 2015, but the error is happening with IIS Express. When I hit ctrl+F5 (run without debugging), the browser window opens and just sits there doing nothing (cursor spins forever).

snapshot of toolbar

The Output -> Debug window is empty, so not sure what is the root cause of this error. Not sure if there is anywhere else I have to look for more error details.

I have

Microsoft Visual Studio Professional 2015 Version 14.0.25123.00 Update 2 
Microsoft .NET Framework Version 4.6.01038
Windows 10 pro v1511 OS build 10586.218  
DNVM 1.0.0-rc1-15540
Microsoft .NET Development Utility Clr-x86-1.0.0-rc1-16609

I even tried dnvm upgrade, which upgraded dnx to dnx-clr-win-x86.1.0.0-rc1-update2, but error is still occurring.

I tried most of solutions listed in

An error occurred attempting to determine the process id of the DNX process hosting your application

and

An error occurred attempting to determine the process id of the DNX process hosting your application on clean installed windows 10 + vs2015

and none of them worked.

here is a simple test application if any one wants to look at it. https://github.com/vinodbadugu/aspnet5test

launchsettings.json ( UPDATE 1 )

    {
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:44342/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "http://localhost:44342/",
      "environmentVariables": {
        "Hosting:Environment": "Development"
      },
      "sdkVersion": "dnx-clr-win-x86.1.0.0-rc1-update2"
    },
    "web": {
      "commandName": "web",
      "environmentVariables": {
        "Hosting:Environment": "Development"
      }
    }
  }
}

project.json

{
  "version": "1.0.0-*",
  "compilationOptions": {
    "emitEntryPoint": true
  },

  "dependencies": {
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.Diagnostics":  "1.0.0-rc1-final"
  },

  "commands": {
    "web": "Microsoft.AspNet.Server.Kestrel"
  },

  "frameworks": {
    "dnx451": { },
    "dnxcore50": { }
  },

  "exclude": [
    "wwwroot",
    "node_modules"
  ],
  "publishExclude": [
    "**.user",
    "**.vspscc"
  ]
}

startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.AspNet.Http;
using Microsoft.Extensions.DependencyInjection;

namespace Tutorial1
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app)
        {
            app.UseIISPlatformHandler();
            app.UseDeveloperExceptionPage();

            app.Run(async (context) =>
            {
                await context.Response.WriteAsync("Hello World!");
            });
        }

        // Entry point for the application.
        public static void Main(string[] args) => WebApplication.Run<Startup>(args);
    }
}

dnvm list

Active Version           Runtime Architecture OperatingSystem Alias
------ -------           ------- ------------ --------------- -----
       1.0.0-rc1-update1 clr     x64          win
       1.0.0-rc1-update1 clr     x86          win
       1.0.0-rc1-update1 coreclr x64          win
       1.0.0-rc1-update1 coreclr x86          win
  *    1.0.0-rc1-update2 clr     x86          win             default
       1.0.0-rc1-update2 coreclr x86          win

Answer 1

I had the same problems running debugging in IISExpress. Also on Windows 10. Always getting the "An error occurred attempting to determine the process id of the DNX process hosting your application". Even for new webapps with no changes and authentication. Tried all the StackOverflow solutions listed by Vinod above.

What worked for me was installing the recent update of the "Microsoft ASP.NET and Web Tools" (Version 14.1.20512.0 -- dated 5/18/2016 - https://visualstudiogallery.msdn.microsoft.com/c94a02e9-f2e9-4bad-a952-a63a967e3935 ). The update was literally out the day after I tried almost everything. It even worked for debugging of apps on IISExpress with windows authentication enabled.

Hope this helps.

Answer 2

Please edit your launchsettings.json restart VS and try to Debug again.

{
  ...
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "Hosting:Environment": "Development"
      },
      "sdkVersion": "dnx-clr-win-x86.1.0.0-rc1-update2"
    },
    ...
}