Issue WordPress Toolkit cause 403 Forbidden for blogs.dir files after Restrict access to files and directo

[Lucaele]

Hi all,
i have Plesk Onyx 17.8.11 on Debian 9 and i used WordPress Toolkit for my WordPress MU installation.
After launch "Restrict access to files and directories" from Security Status, all uploaded files are 403 Forbidden... and this action is not reversible.
Files are present on FTP like before and visible with a direct url but not from WordPress.

Forbidden from WP: http://<domain>/<subfolder site name>/files/2019/09/Screenshot-2019-09-03-at-08.33.09.png
View correctly: http://<domain>/wp-content/blogs.dir/<site number>/files/2019/09/Screenshot-2019-09-03-at-08.33.09.png

How can i fix this problem?
Thanks
Luca

 

[Bitpalast]

It seems that the Rewrite rules in .htaccess are not working correctly. Is .htaccess accessible (e.g. with 0750 mode)? Does the document root directory have the correct owner and group? (ftp username : psaserver) and each subdirectory (ftp username : psacln)? Is PHP set to PHP-FPM (or PHP-CGI) via Apache (if set to Nginx, .htaccess won't work)?