To make LemonLDAP::NG work with SELinux, you may need to set up some options.
chcon -t httpd_sys_script_exec_t /var/lib/lemonldap-ng/manager/*.pl chcon -R -t httpd_sys_content_t /var/lib/lemonldap-ng/manager/skins
chcon -R -t httpd_sys_rw_content_t /tmp
setsebool -P httpd_can_network_memcache 1
setsebool -P httpd_can_network_relay 1