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Learn how to configure Plesk that it serves subdomains addressed with www.subdomain.domain.com

Problem: subdomain & www in Plesk

Solution - follow the following steps to make your subdomain accessible with www .

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

   Normally this file is located in /srv/vhosts/domain/subdomains/subdomain/vhost.conf .
   Create the file, if there is no file yet. Add the following line, save it and exit the editor.
   ServerAlias www.subdomain.domain.com

   What does ServerAlias www.subdomain.domain.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.

2. (optional - maybe necessary in Plesk 7/7.5, but works without in Plesk 8)
   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 => domain.com => DNS
   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, if you don't know it.
   3. Now you create a new entry with the button Add new entry  - use the following values:
      
      • Record type: A
      • Domain name: www.subdomain (Plesk 8)
        
      • IP address: enter the IP address that you copied in step 2.2, e.g. 111.111.111.111
        
      Press OK to add the new entry to the DNS.

   4. Check if there is a new entry wit the following value:
      www.subdomain.domain.com A 111.1111.111.111

3. Recreate the Plesk / Apache configuration for the whole domain
   /usr/local/psa/admin/sbin/websrvmng -u --vhost-name=domain.com
4. Restart Apache to read the new configuration and serve pages with www.subdomain.domain.com
   apache2ctl restart