AH01071: Got error 'Primary script unknown'

I searched google and based on the logs its 404 error.

How could i make such 404 crawls return nginx 444? any guide for this? (i wanted initially because of so many ip visits from seznam bot and other bots. i dont know if im being DOSed or over-crawled )

another, my .htaccess ErrorDocument 404 /index.html doesnt get executed.

@ScIT when i upgraded hestia using apt-get upgrade , i see a notice about php-frm not set as default. i ignored it, could it be the reason? i could not reproduce the error or message. but as far as i remember it says like aen2mod ___ .

help greatly appreciated …