A website shows error 'File not found' when PHP is handled by FPM and index.html file is absent.
This is Plesk internal issue with id #PPPM-3812 , which is planned to be fixed in future product updates.
Make sure that Nginx is enabled:
# /etc/init.d/nginx status
nginx.service - Startup script for nginx service
Loaded: loaded (/lib/systemd/system/nginx.service; enabled)
Active: active (running) since Thu 2015-12-24 11:02:47 NOVT; 6h ago
Make a backup of current
# cp /opt/psa/admin/conf/templates/default/domain/nginxDomainVirtualHost.php /opt/psa/admin/conf/templates/default/domain/nginxDomainVirtualHost.php_back
Download the attached file and place it into