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    Block hack attempts from all foreign & unknown locations.

    The file /etc/hosts.deny on Unix/Linux can block login attempts based on counties. The below is a simple host.deny file to block all countries but your own ( in my case Australia), sure this is not the whole answer to securing a system but it sure cuts down the number of hack attempts.

    sudo vi /etc/hosts.allow

    #
    # hosts.deny This file describes the names of the hosts which are
    # *not* allowed to use the local INET services, as decided
    # by the '/usr/sbin/tcpd' server.
    #
    # We will block *all

    by:Nigel Leck - 25 Jul 2013