Symptoms
- 
Website is showing web server default page. 
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There are both index.html file generated by Plesk, and index.php in the document root of example.com and they are shown in the following order: # ls /var/www/vhosts/example.com/httpdocs/ | grep index 
 index.html
 index.php
Cause
In the Apache configuration file of this domain, index.html is specified first and therefore has priority. So web server shows index.html to clients.
Resolution
- 
Connect to a Plesk server via SSH. 
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Rename or remove index.html: # mv /var/www/vhosts/example.com/httpdocs/index.html /var/www/vhosts/example.com/httpdocs/index.html.bak