TechExpertBlog

Setting up a subdomain with PLESK is easy. Just click the Subdomins icon and click the Add New Subdomain. The subdomain entry will be added to the DNS setting if it’s not exist.

However, in other cases, you may encouter problems with subdomain. For example, you have have forgotten you check one of the options, you may want to remove one of the option or the IP address of the web site has been changed. Though the subdomain folder has created properly, you will see the default page telling you the subdomain is not setting up properly when you access http://subdomain.domain.com,

You can fix this by

/usr/local/psa/admin/bin/websrvmng –reconfigure-vhost –vhost-name=domain.com

the path of the executable may be vary depending on the system.