Preventing Brute Force Attacks With BlockHosts On Debian Etch

“In this article I will show how to install and configure
BlockHosts on a Debian Etch system. BlockHosts is a Python tool
that observes login attempts to various services, e.g. SSH, FTP,
etc., and if it finds failed login attempts again and again from
the same IP address or host, it stops further login attempts from
that IP address/host. By default, BlockHosts supports services that
use TCP_WRAPPERS, such as SSH, i.e. services, that use
/etc/hosts.allow or /etc/hosts.deny, but it can also block other
services using iproute or iptables…”