Remotely connect to .net core self hosted web api

Question

I have a simple .net core web api with one action:

[Route(\"[action]\")]
public class APIController : Controller
{
    // GET api/values
    [HttpGet]
    pu         


        

Answer 1

My guess is that the issue isn't in your controller, it is in program.cs. You need to modify the construction of your WebHost

var host = new WebHostBuilder()
.UseKestrel()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseUrls("http://localhost:5000", "http://odin:5000", "http://192.168.1.2:5000")
.UseIISIntegration()
.UseStartup<Startup>()
.Build();

Unless you add the UseUrls line, Kestrel isn't going to listen outside of localhost. This makes sense, because in a normal situation Kestrel will be sitting behind a reverse proxy like IIS or NGNIX and doesn't need to bind to external URLs.

Answer 2

You can simply do the following to create your WebHost, this will allow remote connections to kestrel.

var host = WebHost.CreateDefaultBuilder(args)
                .UseUrls("http://0.0.0.0:80")
                .UseStartup<Startup>()
                .Build();

After using the following code I still wasn't able to access my API remotely, I had to disable the network adapters created by Docker in the windows control panel (Control Panel\Network and Internet\Network Connections)

Answer 3

There is a more accurate way when there are multi IP addresses available on the local machine. Connect a UDP socket and read its local endpoint:

string localIP;
using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 0))
{
    socket.Connect("8.8.8.8", 65530);
    IPEndPoint endPoint = socket.LocalEndPoint as IPEndPoint;
    localIP = endPoint.Address.ToString();
}

Answer 4

In my case (.NET core 2.1) I had to modify the Properties/launchSettings.json file.

Set the applicationUrl to a list of allowed urls separated by semicolons like this

"applicationUrl": "https://localhost:5001;http://odin:5000"

Hope this helps someone out there.

Answer 5

Another way to solve this problem is editing "applicationhost.config" file. in project folder -> .vs (Hidden folder) -> config open "applicationhost.config" file. Under sites section, site name="your project name" in Bindings node add another binding and change localhost with your "IP/Domain" on "bindingInformation", like This:

<site name="project_name" id="2">
    <application path="/" applicationPool="Clr4IntegratedAppPool">
     <virtualDirectory path="/" physicalPath="D:\Projects\project_directory" />
    </application>
    <bindings>
     <binding protocol="http" bindingInformation="*:5000:localhost" />
     <binding protocol="http" bindingInformation="*:5000:192.168.1.2" />
     <binding protocol="http" bindingInformation="*:5000:odin" />
    </bindings>
</site>

remember Visual Studio must be run as Administrator.

Answer 6

The best way is to adjust the launchSettings.json, which is located inside the Properties folder.

Change

"applicationUrl": "https://localhost:5001"

to

"applicationUrl": "https://0.0.0.0:5001"

This allows the Kestrel Web Server to listen for traffic from all Network Interfaces.