Issue Automatic redirect instead of Default page

[andsrv]

I have 10 domains in Plesk 12.5.30-43 on a VPS. I recently added a new domain to my Plesk panel without any issues. Now I have noticed a weird change: everytime I try to access a subdomain (that is not existent) on any of the 10 domains, the request is automatically forwarded to the new domain I've added recently.
Example: New domain = example.com; Other domains = a.co, b.co, c.co
Trying to reach subdomain.a.co (not existent on server) = redirect to example.com
Normally the Default page would be shown.

Where does this error come from and how can I fix it?

 

[ipilipenko]

Hello,

Try to access "Tools&Settings->IP Addresses". Does 'example.com' specified as default site there?