On: How to close a running process's socket

[Freaky]

BSD's have tcpdrop(8):

     If	a connection to	httpd(8) is causing congestion on a network link, one
     can drop the TCP session in charge:

	   # sockstat -c | grep	httpd
	   www	    httpd      16525 3	tcp4 \
		   192.168.5.41:80	192.168.5.1:26747

     The following command will	drop the connection:

	   # tcpdrop 192.168.5.41 80 192.168.5.1 26747