https://www.plesk.com/kb/support/website-hosted-in-plesk-shows-error-502-in-the-browser-ah01071-got-error-primary-script-unknown/
Website hosted in Plesk shows error 502 in the browser: AH01071: Got error 'Primary script unknown'...
Symptoms Website displays the error 502 Bad Gateway. Under domain logs /var/www/vhosts/example.com/logs the following error can be found: [proxy_fcgi:error]...