Article 6GCWS [Ubuntu server / Apache] Website does not load css or cookies

[Ubuntu server / Apache] Website does not load css or cookies

by
andrkac
from LinuxQuestions.org on (#6GCWS)
On my ubuntu server (with apache2) I have few websites: nextcloud, webtrees and others.
All of them are placed just in /var/www/html as subdirectories, without vhosts.

It worked always, but via http protocol, not https.

Today I've installed letsencrypt. And most of sites work as expected, the only exception is webtrees - it does not load css files and as I guess - it does not play with cookies: I see only text page with login fields but when I try to login, I just come back to the same place.

This is only on that one site (webtrees), another ones work. Also - tested few browsers and OSs and everywhere is the same. So the issue is on server side. What logs/configs should I check?
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