An error occurred while attempting to determine the process id of dotnet.exe which is hosting your application. One or more errors occurred

Question

I know there is a million question on this subject, but non of the solutions helped me yet.

I was implementing IdentityServer in my solution and everytime when I try to run it i get this error:

It is occurring as soon as I press to debug on IISExpress. I have read somewhere that the problem is related to .NET Core and that helpful thing is if you turn off VS2015, remove package.lock.json, but that solution didn't helped me.

Is there some way to see more details for this problem? This error is not suggestive at all, some log file or something?

All of my references looks ok:

This is my package.json:

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
        "Microsoft.AspNetCore.Diagnostics": "1.1.0",
        "Microsoft.ApplicationInsights.AspNetCore": "1.0.0",
        "Microsoft.AspNetCore.Mvc": "1.1.0",
        "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
        "Microsoft.AspNetCore.Routing": "1.1.0",
        "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
        "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
        "Microsoft.AspNetCore.StaticFiles": "1.1.0",
        "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0",
        "Microsoft.Extensions.Configuration.Json": "1.1.0",
        "Microsoft.Extensions.Logging": "1.1.0",
        "Microsoft.Extensions.Logging.Console": "1.1.0",
        "Microsoft.Extensions.Logging.Debug": "1.1.0",
        "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
        "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.1.*",
        "IdentityServer4": "1.0.0-rc5"
  },

  "tools": {
    "BundlerMinifier.Core": "2.0.238",
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

Maybe I am missing some reference that is necessary for use of IISExpress? I simply have no idea what can be the possible problem. Has anyone experienced something similar?

Have you got any solution for this one? As I am also facing the same issue. — Mrunal, Jan 27 '17 at 06:54
Possible duplicate of [An error occurred attempting to determine the process id of dotnet.exe which is hosting your application. One or more error occured](http://stackoverflow.com/questions/40965442/an-error-occurred-attempting-to-determine-the-process-id-of-dotnet-exe-which-is) — Doug, Apr 27 '17 at 21:41

score 2 · Answer 1 · edited Apr 28 '17 at 15:25

2

I don't know if you are using SSL for your project. If you are, then the link given by Doug would solve the problem. If you are not, then follow these steps to fix the issue:

Open project properties
Open Debug Menu
Uncheck Enable SSL and Rewrite the App Url (http://localhost:5000 or whatever port you are using. Make sure there is no 's' in 'http'!)
Ctrl+S (save the file)
Close all instances of Chrome or IE
Reopen your project in VS.
Now, run your project. (Click IIS Express)
Thats all.

Hope it works for you.

edited Apr 28 '17 at 15:25

Keshan Nageswaran

8,060
3
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answered Apr 28 '17 at 09:52

heyAkhilesh

639
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Thanks a million <3 – Asım Gündüz Dec 27 '18 at 17:09

Doff3n · Answer 2 · 2018-02-13T21:27:24.843

I needed https so this worked for me:

Go into Add/Remove programs and fix IISExpress, this reinstalls an IIS Certificate
Open project properties
Open Debug Menu Uncheck Enable SSL and Rewrite the App Url (http://localhost:5000 or whatever port you are using. Make sure there is no 's' in 'http'!)
Ctrl+S (save the file)
Launch the application
Stop the application
Open project properties and enable ssl again
Ctrl+S (save the file)
Edit launchSettings.json under Properties folder, make sure all ports are set correctly and that all urls have https
Save launchSettings.json and launch you website again

An error occurred while attempting to determine the process id of dotnet.exe which is hosting your application. One or more errors occurred

2 Answers2