No connection could be made because the target machine actively refused it 192.168.131.196:1888

  static void Main(string[] args){IPAddress[] ips = Dns.GetHostAddresses("");foreach (var ipAddress in ips){Console.WriteLine(ipAddress);   }Console.ReadLine();}<span style="white-space:pre">      </span>

首先单独运行了一下

<img src="https://img-blog.csdn.net/20150508165409584?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMzI5MTMzNw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

有ip6，有ip4

原代码中关于ip的是这样

客户端

 IPAddress[] serverIp = Dns.GetHostAddresses("");
tbxSrvIp.Text = serverIp[0].ToString();
tbxSrvIp.SelectAll();
tbxPort.Text = "1888";

服务器端

   IPAddress[] listenIp = Dns.GetHostAddresses("");
localAddress = listenIp[0];

————————————————————————————————————————————————————

我把0改成2，也就是v4，就可以了。

具体原因不太懂。

<img src="https://img-blog.csdn.net/20150508165733102?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMzI5MTMzNw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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