All the plesk websites are loading default webpage

Sometimes if we access any website from our server, the browser will go to the default website of plesk.

Here is the possible reason for this problem..

1. Check the file /etc/httpd/conf/httpd.conf for conf.d sections by using grep command.

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[root@one-res3 ~]# grep conf.d /etc/httpd/conf/httpd.conf
Include conf.d/*.conf
[root@one-res3 ~]#
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Check whether "Include conf.d/*.conf" is commented or not. Most of the time this is the problem for the websites are loading default page. If it is commented then uncomment this line and restart the httpd service by issueing the following command.

/etc/init.d/httpd restart