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

问题描述

我正在寻找一种简单的方法来查看服务器上是否打开了远程 UDP 端口

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

推荐答案

注意几个防火墙/网络设置/IDS 等可能会影响结果...以下方法不是 100% 可靠，但它是UDP 恕我直言唯一可行的方法(因为 UDP 是无连接的).

您可以使用 UdpClient, 在底层"http://msdn.microsoft.com/en-us/library/system.net.sockets.udpclient.client.aspx">socket, 建立连接到那个远程服务器/端口，发送一些小消息(byte[]！)并调用接收.

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.

如果端口关闭，您会收到一个异常，说明连接被强制关闭(SocketException with ErrorCode 10054 = WSAECONNRESET)... 表示端口未打开.

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，您要么收到答复，要么收到超时异常 - 两者都应解释为UDP 端口已打开".

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

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