Hi I would like to contribute to the wiki.centos.org: username: boel subject: nagios incompatibility with centos 5.2 location: http://wiki.centos.org/HowTos/Nagios content: A security feature of centos 5.2 SELinux prevents the access from the apache httpd server to the needed /var/nagios files. The error manifests itself in the /var/log/messages as "SELinux is preventing the tac.cgi from using potentially mislabeled files ./status.dat (var_t)". A workaround is to execute the command: chcon -R httpd_sys_content_t /var/nagios Please grant me access Regards Martin Boel