ConfigServer Firewall (AKA csf) is an essential security tool for Linux based server and VPS. The installation of CSF is pretty straight forward and is described here: http://configserver.com/free/csf/install.txt However, some of the iptables modules required by the csf might not be present in the server and when the perl test command ( # perl /usr/local/csf/bin/csftest.pl…
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