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Plesk Subdomain with www Fix

Add one line to the special configuration file for the subdomain.

Normally this file is located in /srv/vhosts/yourdomain/subdomains/yoursubdomain/conf/vhost.conf .

If you do not see the vhost.conf file then go ahead and create it with the following text:
ServerAlias www.yoursubdomain.yourdomain.com

If you do not have write permissions, you will probably have to do this work via SSH.

What does ServerAlias www.yoursubdomain.yourdomain.com mean?

This is a Apache configuation that says that Apache will also serve the subdomain if you access it with www. This is normally used for the domain name, but also working for sub-domains.

If your www.yoursubdomain.yourdomain.com is not accessible please follow the next steps:

  1. Add a record type in the DNS zone of the domain for the subdomain starting with www. Select the following menu entries:
    Server => Domains => yourdomain.com => DNS Settings
  2. There you'll see a list of DNS entries for the domain. Check the IP address for the subdomain entry - copy to clipboard or write it down for reference (you will need it a minute!)
  3. Now you create a new entry with the button Add new entry - use the following values:
    • Record type: A
    • Domain name: www.yoursubdomain
    • IP address: enter the IP address that you copied in step 2, e.g.
    Press OK to add the new entry to the DNS.
  4. Check if there is a new entry wit the following value:
    www.yoursubdomain.yourdomain.com A

Recreate the Plesk / Apache configuration for the whole domain via SSH:

/usr/local/psa/admin/sbin/websrvmng -u --vhost-name=yourdomain.com

Restart Apache to read the new configuration and serve pages with www.yoursubdomain.yourdomain.com via SSH:

apachectl restart