[FIXED] Why (non existing) subdomain of my add-on domain redirecting to primary domain?

Issue

I am using 1and1 cloud with plesk.

I have a http://primary.com and an http://addon.com

Right now if if some one enter any none existing subdomain e.g. blabla.addon.com, the URL in browser address bar stays the same but contents coming from http://primary.com/

I wanted contents to come from http://addon.com

Can anyone please guide me to the right direction?

Solution

This happens because by default Plesk will serve it's "Web Server's Default Page" template.

If you want to change this behaviour you need to set a default domain that will be served instead.

The setting you are looking for is located at:

Tools & Settings > IP Addresses > Your IP (click) > Default site > Domain (addon.com)

Answered By - uu01

Answer Checked By - Timothy Miller (PHPFixing Admin)