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If you are using an external MySQL server, and an AtMail installation on an operating system that has SELinux enabled, you might experience the following: the installation fails when connecting to the MySQL server connecting manually using the mysql command succeeds. In this case, you need to set SELinux so that it allows HTTP modules [...]

source: http://www.cyberciti.biz/faq/rhel-fedora-redhat-selinux-protection/ SELinux enforces the idea that programs should be limited in what files they can access and what actions they can take. However, by default it is turned off under RHEL / CentOS 5.x server? How do I turn it on? SELinux is a kernel security extension, which can be used to guard against [...]