I just did a fresh installation of The Perfect Server - CentOS 6.4 x86_64 (Apache2, Dovecot, ISPConfig 3) and ISPConfig 3.0.5.1. There are some things that don't work correctly. ISPConfig shows an error in the ISPConfig RKHunter Log panel as follows: System checks summary ===================== File properties checks... Required commands check failed This is because when we installed RKHunter, The file of stored file properties (rkhunter.dat) wasn't created, and should be created. I patched up some of these errors by typing the following commands: rkhunter --propupd Can the author please fix the installation guide on step #21 Install rkhunter? from: yum install rkhunter to: yum install rkhunter rkhunter --propupd