Here are some of my tuts. Hope it helps... http://www.infosecprojects.net/en/linuxtutorials/ssh-public-key.html http://www.infosecprojects.net/en/linuxtutorials/mod-security.html http://www.infosecprojects.net/en/linuxtutorials/secure-php.ini.html http://www.infosecprojects.net/en/linuxtutorials/find-out-hacked.html http://www.infosecprojects.net/en/linuxtutorials/test-snort.html http://www.infosecprojects.net/en/linuxtutorials/syslog-ng.html http://www.infosecprojects.net/en/linuxtutorials/server-hardening.html
Another interesting tutorials : http://www.pcc-services.com/iptables.html http://troy.jdmz.net/rsync/index.html