We tried, but could not find /doku.php?id=doku.php.faq:systemadmin:how_to_install_a_certificate_signed_by_a_recognized_certificate_authority&do=login§ok=c9c152151b6b8d335a0ed5afc08847c3
But hey, you don't have to leave empty handed!
Here are some things you can try instead: