Why are not all images displayed on sites when CSF is enabled?

Question

linux

Such a problem. When Config Server Firewall (CSF) + LFD is enabled, not all images are loaded on the site. On those pictures where they are not loaded in the browser console, an error 503 is displayed. As soon as you cut down the csf, everything loads well.
Where in the config can be the solution to my question?

Answer 1

по моему вам нужно почитать за 503 тут все очевидно