www.domain.tld problematic

In settings of a WordPress 3.5.1 installation, I’ve provided
WordPress URL as http://domain.tld
Website URL as http://domain.tld

My zone file goes like this

$ORIGIN domain.tld.
@ 28800 IN SOA ns1.something.net. tech.something.net. 2013040615 10800 3600 604800 28800
@ 28800 IN A w.x.y.z
* 30 IN CNAME domain.tld
www 30 IN CNAME domain.tld

The site’s working fine at http://domain.tld

But if someone tries to visit http://www.domain.tld they get

There doesn’t seem to be a wp-config.php file. I need this before we can get started.

Need more help? We got it.

You can create a wp-config.php file through a web interface, but this doesn’t work for all server setups. The safest way is to manually create the file.

Create a Configuration File

What’s going on here? What am I doing wrong?