Hosting an .net core asp.net mvc web application from a custom port number

Create a file, hosting.json in the root of your project that contains:

{
  "server.urls": "http://localhost:8500"
}

(But substitute the port number you wish to use in place of 8500)

In Program.cs add a config item that uses that file, and add it as a configuration item to the WebHostBuilder, like so:

public class Program
{
    public static void Main(string[] args)
    {
        var config = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("hosting.json", optional: true)
            .Build();

        var host = new WebHostBuilder()
            .UseKestrel()
            .UseConfiguration(config)
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseStartup<Startup>()
            .Build();

        host.Run();
    }
}

In project.json ensure hosting.json gets included when the file is published, by adding it.

"publishOptions": {
    "include": [
      "wwwroot",
      "Views",
      "Areas/**/Views",
      "appsettings.json",
      "hosting.json",
      "web.config"
    ]
  },

Then dotnet publish as usual.

Source

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