有人知道如何通过windows命令行关闭单个连接的TCP或UDP套接字吗?
我在谷歌上搜索了一下，看到一些人也问了同样的问题。但是答案看起来像是netstat或netsh命令的手册页，重点关注如何监视端口。我不想要关于如何监控它们的答案(我已经这样做了)。我想干掉他们。
EDIT, for clarification: Let's say that my server listens TCP port 80. A client makes a connection and port 56789 is allocated for it. Then, I discover that this connection is undesired (e.g. this user is doing bad things, we asked them to stop but the connection didn't get dropped somewhere along the way). Normally, I would add a firewall to do the job, but this would take some time, and I was in an emergency situation. Killing the process that owns the connection is really a bad idea here because this would take down the server (all users would lose functionality when we just want to selectively and temporally drop this one connection).
是的，这是可能的。你不必是当前拥有套接字的进程来关闭它。考虑一下，远程计算机、网卡、网线和操作系统都可能导致套接字关闭。
还要考虑Fiddler和Desktop VPN软件可以将自己插入到网络堆栈中，并显示您的所有流量或重新路由所有流量。
所以你真正需要的是Windows提供一个API，直接允许这样做，或者有人写了一个程序，操作起来有点像VPN或Fiddler，并给你一种方法来关闭通过它的套接字。
至少有一个程序(CurrPorts)可以做到这一点，我今天用它来关闭在CurrPorts启动之前启动的进程上的特定套接字。当然，要做到这一点，您必须以管理员身份运行它。
Note that it is probably not easily possible to cause a program to not listen on a port (well, it is possible but that capability is referred to as a firewall...), but I don't think that was being asked here. I believe the question is "how do I selectively close one active connection (socket) to the port my program is listening on?". The wording of the question is a bit off because a port number for the undesired inbound client connection is given and it was referred to as "port" but it's pretty clear that it was a reference to that one socket and not the listening port.
如果不关闭拥有这些套接字的进程，就不能关闭套接字。套接字属于打开它们的进程。因此要找出Unix/Linux的进程ID (PID)。像这样使用netstat:
netstat -a -n -p -l
这将打印如下内容:
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1879/sendmail: acce
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 1860/xinetd
其中-a打印所有的套接字，-n显示端口号，-p显示PID， -l只显示正在监听的内容(这是可选的，取决于你想要什么)。
你想要的真实信息是PID。现在我们可以通过下面的操作关闭这个进程:
kill 1879
如果你要关闭一个服务，最好使用:
service sendmail stop
Kill实际上只是杀死了这个进程和它拥有的所有子进程。使用service命令运行init. conf中注册的关机脚本。d目录。如果你在一个服务上使用kill，它可能无法正常启动，因为你没有正确关闭它。这取决于服务。
不幸的是，Mac在这方面与Linux/Unix不同。你不能使用netstat。如果你对Mac感兴趣，请阅读本教程:
http://www.tech-recipes.com/rx/227/find-out-which-process-is-holding-which-socket-open/
如果你在Windows上使用TaskManager来杀死进程，使用services UI来关闭服务。你可以像Linux/Unix一样在Windows上使用netstat来识别PID。
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/netstat.mspx?mfr=true
