Originally https://bbs.archlinux.org/viewtopic.php?pid=2242464

Repeating answer from https://bbs.archlinux.org/viewtopic.php?pid=2242464#p2242464 :

lighttpd 1.4.79 hardened the systemd lighttpd.service, and that lighttpd.service is install by Arch Linux https://gitlab.archlinux.org/archlinux/packaging/packages/lighttpd/-/blob/main/PKGBUILD?ref_type=heads#L87

The lighttpd 1.4.79 release notes highlighted this in BEHAVIOR CHANGES: see https://redmine.lighttpd.net/projects/lighttpd/wiki/Release-1_4_79

See the "# systems capability hardening" section in https://git.lighttpd.net/lighttpd/lighttpd1.4/src/branch/master/doc/systemd/lighttpd.service#L29

Please post which of those setting is causing trouble for your setup and let us submit some updated instructions to MediaWiki install docs.