Is some cases, while browsing your domain you will be getting forbidden page. This is the problem with the directory / files permissions.
From /var/www/vhosts/domain.com/statistics/logs/error_log : You can get the error
[critical] [client 192.168.1.1] (13)Permission
denied: /var/www/vhosts/domain.com/httpdocs/.htaccess pcfg_openfile:
unable to check htaccess file, ensure it is readable
This is due to incorrect permission for the httpdocs/httpsdocs
chmod 755 httpdocs
chmod 755 httpsdocs
This will work for you.