Website on Plesk is inaccessible: 403 Forbidden: No matching DirectoryIndex

Symptoms

• The website is inaccessible. The following error is shown in a browser:

  CONFIG_TEXT: 403 Forbidden

• The following error can be found in the domain Apache logs /var/www/vhosts/system/example.com/logs/error_log:

  CONFIG_TEXT: [autoindex:error] [pid 30047] [client 203.0.113.2:36811] AH01276: Cannot serve directory /var/www/vhosts/example/httpdocs/: No matching DirectoryIndex (index.html,index.cgi,index.pl,index.php,index.xhtml,index.htm,index.shtml) found, and server-generated directory index forbidden by Options directive

• All the website content is located in the custom Document root (i.e. /var/www/vhosts/example.com/subdomains/app/httpdocs) instead of the default one( /var/www/vhosts/example.com/httpdocs ).

Cause

Domain misconfiguration.

Resolution

1. Log into Plesk
2. Make sure that the error is the same as in symptoms.
3. Modify the Document Root in Plesk > Domains > example.com > Hosting Settings setting the default one - /httpdocs:
   

Note: If the menu is absent or different, contact server's administrator/Hosting Provider or upgrade to the latest Plesk version.