asp.net core - How to access HTTP port 5001 from public internet

Question

I have Windows Server 2016 Data center x64, .NET Core SDK 5.0 preview, Microsoft SQL Server 2019

On server: https://localhost:5001/publisher/all ok

On server https://127.0.0.1:5001/publisher/all ok

On server: Firewall Open port 5000-6000 outbound

from my computer (or any PC on the world) https://45.118.145.72:5011/publisher/all not ok

How to access https://45.118.145.72:5011/publisher/all from public internet?

Answer 1

Asp.NET core apps bind to the "localhost" network interface with default settings. This network interface is not available from other hosts.

You can modify this using UseUrls()during host setup.

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseStartup<Startup>();
            webBuilder.UseUrls("http://0.0.0.0:5001");
        });

Examples:

webBuilder.UseUrls("http://127.0.0.1:5001"); // only from localhost
webBuilder.UseUrls("http://localhost:5001"); // only from localhost
webBuilder.UseUrls("http://0.0.0.0:5001");   // allow all hosts

Docs: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/servers/kestrel?view=aspnetcore-3.1#kestrel-in-aspnet-core-apps