Error

Dizic

Access to Font at 'https://****.ru/forum/assets/fonts/fontawesome-webfont.woff2?v=4.7.0' from origin 'http://.ru' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://***.ru' is therefore not allowed access

Pollux

You mixed up secure and insecure access. Make shure to have the right domain and access method for the url variable in your config.phpfile.

Dizic

Pollux all in .htaccess prescribed:
RewriteCond %{HTTPS} =off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [QSA,L]

Dizic

and where is the authorization file?

Pollux

Open the config.php file in your Flarum directory and change the url entry to https://.... Your browser doesn't even attempt to download the font file because it comes from another source (http://... instead of https://...).