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Fedora Core3 and later versions have enabled SELinux security libraries by default. Similar options are enabled in Red Hat Enterprise Linux 4 and ```CentOS``` 4.2. If SELinux policies are not designed correctly, they can break PHP scripts with artificial restrictions that are not expected in standard Unix environment.

If you get errors on Fedora and other OSes with SELinux and want to be sure that problems are not related to SELinux, make sure that you can reproduce your problem with SELinux disabled.

SELinux restrictions can be disabled with command {{setenforce 0}}. This command turns all security blocks into warnings. Command will be active until machine is rebooted or {{setenforce 1}} command is issued. If you want to make it permanent, modify {{/etc/sysconfig/selinux}} and set SELINUX variable to {{permissive}}

SELinux configuration can be reviewed with the {{sestatus -v}} command.

If you get "permission denied" errors on SMTP, IMAP, database or LDAP connections, check {{httpd_can_network_connect}} policy or allow network connections with {{setsebool -P httpd_can_network_connect true}} command.

You can find more information about SELinux in [http://fedora.redhat.com/docs/selinux-faq-fc3/ Fedora SELinux FAQ].

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