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Most secure GNU/Linux distribution / OS for servers

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linux-howto

http://chakra-project.org – In fact any linux is secure but all depends on how you configure the system. You should consider installing all kind of protection procedures suck as Fail2Ban, RkHunter,  ClamAv, a proper version of PHP, hardened with the sushoin  patch, some kind of mac hardenning (Tomoyo / SELinux /AppArmor) etc, to me Debian is perfect for a server (HowTos)