I had the same issue, I switched my Directadmin to openlitespeed using this tutorial: https://docs.directadmin.com/webservices/openlitespeed/general.html
and I cant load my Wordpress website, it looks like openlitespeed server is not working?
Before change my apache worked well, all websites was OK, what should I do to force openlitespeed to work?
Service Monitor looks like below: