centos 部署 asp.net core Error -99 EADDRNOTAVAIL address not available解决

centos7.3上部署 asp.net core 错误如下：

Hosting environment: Production
Content root path: /home/netcore
Now listening on: http://localhost:5000
Application started. Press Ctrl+C to shut down.
warn: Microsoft.AspNetCore.Server.Kestrel[0]
Unable to bind to http://localhost:5000 on the IPv6 loopback interface: 'Error -99 EADDRNOTAVAIL address not available'.

解决办法：

修改Program.cs文件指定运行url

public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseUrls("http://*:8081")
                .Build();
    }