如何测试远程UDP端口 [英] How to test a remote UDP Port

问题描述

我要寻找一个简单的方法，如果一个远程的UDP端口是开放的服务器上

I am looking for a simple way to see if a remote UDP port is open on a server

推荐答案

要注意的是一些防火墙/网络设置/ IDS等可能影响结果......下面的方法不是100％可靠的，但它是唯一的方法可能与UDP恕我直言（因为UDP是无连接的）。的

您可以使用<一个href="http://msdn.microsoft.com/en-us/library/system.net.sockets.udpclient.aspx"><$c$c>UdpClient, 设置接收超时于底层的socket ，的让到远程服务器/端口的连接，的 发送 一些小消息（字节[] ！）和叫<一href="http://msdn.microsoft.com/en-us/library/system.net.sockets.udpclient.receive.aspx"><$c$c>Receive.

You can use UdpClient, set a receive timeout on the underlying socket, make a connection to that remote server/port, Send some small message (byte[] !) and call Receive.

如果该端口是关闭的，你得到一个异常说，连接被强制关闭（ SocketException 与错误code 10054 = WSAECONNRESET ）...这意味着端口未打开。

IF the port is closed you get an exception saying that the connection was forcibly closed (SocketException with ErrorCode 10054 = WSAECONNRESET)... which means the port is NOT open.

否则，要么收到答案或超时异常 - 这两个应该是PTED为UDP端口是开放的跨$ P $

Otherwise you either receive an answer OR a timeout exception - both should be interpreted as "the UDP port is open".

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