ConfigServer Firewall, or CSF, is a common Linux security suite. Log in to your VPS as the root user and run the following commands
to install CSF:
# rm -fv csf.tgz # wget http://www.configserver.com/free/csf.tgz # tar -xzf csf.tgz # cd csf # sh install.sh
After you see: Installation Completed , you can login in Directadmin and under ´extra features´ you will see: ConfigServer Firewall&Security