Subdomain not working on WHM Control Panel

Question

I created a subdomain on my WHM CP but not working, the folder was created correctly and the VirtualHost too but when I try to access nothing happend and even when I try to resolve the host using the command nslookup display this:

nslookup testing.xxx.com
Server:         208.109.xxx.x
Address:        208.109.xxx.x#53

** server can't find testing.xxx.com: NXDOMAIN

And if I execute the same command to my domain:

 nslookup xxx.com
Server:         208.109.xxx.x
Address:        208.109.xxx.x#53

Non-authoritative answer:
Name:   xxx.com
Address: xxx.169.xxx.209

So, anyone knows how to solve it?

Solution

Problem solved!

Following these instructions, now my subdomain works fine.

http://forums.cpanel.net/f34/subdomains-not-working-228132.html

Comments

[Magus]

Thanks, it worked for me, I will edit your answer with the commands from the forum.

[KTM]

One doubt. Is there DNS entry needed for a subdomain?