This is mentioned in a comment on a topic page, though presumably for an earlier version: https://www.mediawiki.org/wiki/Topic:Syxow0why4c0cvvm
====Another Issue====
Interestingly, I started getting a message from Google Chrome whenever I went to post wiki entries saying:
"The information you’re about to submit is not secure". There's an option to "Proceed anyway" or "Go back".
This started after I had MultiTail running viewing apache's logs, but I couldn't see, beyond some kind of file lock examination, how it could work. I figured that it was a coincidence and something else might have happened.
My first thought was that my SSL certificate might have expired. However, the certificate looks valid and good, and the issue survived a reboot.
By inspecting the webpages (in Chrome) and then reviewing the Console, I could see that it was caused by a mixed content problem:
Mixed Content: The page at '<URL>' was loaded over HTTPS, but requested an insecure font '<URL>'.
This request has been blocked; the content must be served over HTTPS.
It seemed that I somehow have some font addresses hardcoded somewhere:
Mixed Content: The page at ... was loaded over HTTPS, but requested an insecure font
'http://128.42.44.180/mediawiki/resources/assets/fonts/BonvenoCF-Light.otf'.
This request has been blocked; the content must be served over HTTPS.
The copy of Chrome on my desktop must somehow have been upgraded? Or something else changed to cause a change in behavior...
The IP is from the old web server at the McNair Center, suggesting that when I migrated the McNair database into the new wiki, I migrated this issue. (Note that it doesn't appear to be something hardcoded into a .css file, or similar -- I can't find any trace on the filesystem and besides, this wiki was built from a fresh install.)
I found the URLs hardcoded in [[MediaWiki:Common.css]] (it must have been moved with the last big batch of pages and I somehow didn't notice!) but then couldn't edit it! It seems that following [https://www.mediawiki.org/wiki/MediaWiki_1.32/interface-admin Mediawiki 1.32], the rights to edit the interface were separated out, and users now need the editinterface right to change anything in the Mediawiki namespace. So, I went to [[Special:UserRights]] and gave myself permission. Then I fixed the problem!
===Install VSFTPD===