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[]
 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();
     }