This script will remove all existing close-wait connections on the server

Debian

$ apt-get install libnet-rawip-perl libnet-pcap-perl libnetpacket-perl

Usage

$ ./kill_close_wait_connections.pl

To install permanently you can do the following:

$ mv kill_close_wait_connections.pl /usr/bin/kill_close_wait_connections
$ chmod +x /usr/bin/kill_close_wait_connections
$ kill_close_wait_connections