Unable to access File Manager for a certain domain or for all domains on a server: Permission denied

Symptoms

• Unable to access File Manager for a certain domain or for all domains on a server:

  PLESK_ERROR: Server Error
  500 PleskUtilException
  Internal error: Unable to find the directory /var/www/vhosts/example.com/: filemng failed: filemng: opendir failed: Permission denied System error 13: Permission denied

• Unable to execute actions on File Manager: such as ZIP extraction, Copy, Rename, Changing Permissions, etc.

• Unable to connect via FTP to a domain main folder or a sub-folder with the following error:

  CONFIG_TEXT: Unable to connect FTP :421 Service not available, remote server has closed.

• Alternatively, it is not possible adding files to archive in Domains > example.com > File Manager > Add to Archive:

  PLESK_ERROR: Unable to create the archive: filemng failed: filemng: /usr/bin/zip execution failed: zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied zip warning: Permission denied.

• WordPress domain may show 500 Internal Server Error error or File not Found, with the following message in the /var/www/vhosts/example.com/logs/error_log:

  CONFIG_TEXT: AH01071: Got error 'PHP message: Unable to open /var/www/vhosts/example.com/httpdocs/wp-content/wflogs/ips.php for reading and writing.\nPHP message: PHP Warning: require_once(/var/www/vhosts/example.com/httpdocs/wp-config.php): failed to open stream: Permission denied in /var/www/vhosts/example.com/httpdocs/wp-load.php on line 37\nPHP message: PHP Fatal error: require_once(): Failed opening required '/var/www/vhosts/example.com/httpdocs/wp-config.php' (include_path='.:/opt/plesk/php/7.2/share/pear') in /var/www/vhosts/example.com/httpdocs/wp-load.php on line 37\n'

  Or

  CONFIG_TEXT: [proxy_fcgi:error] [pid 10954] [client 203.0.113.2:56356] AH01071: Got error 'Primary script unknown\

Cause

Incorrect permissions on domain's folder.

Resolution

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