I am attempting to connect through LAN to my computer hosting an instance of Flarum from another computer in the same router network. My host computer is running Manjaro 18.1.5 with the 5.4.12-1 Linux kernel. I installed the LAMP stack with instructions outlined on Arch Linux wiki. From the host computer I can access and use all functions of the site just fine, but it does not load properly when accessing from another computer, yielding the plain forum title with the "full version of the site could not be loaded" error message. I do not use any custom extensions beyond the standard ones.
To check that my problem was not related to overall connectivity, I tried accessing test.php on the host machine from another computer and it loaded correctly, displaying full PHP information. What can be the problem?