DNS manager problem with zpanel

I have installed zpanel using this script on Ubuntu 12.04

http://ubuntuserverguide.com/2012/11/how-to-install-zpanelx-web-hosting-control-panel-on-ubuntu-server-12-04.html

and everything seem to work properly except of DNS Manager.

First I had to reinstall bind because it didnt started by default. After that I set DNS up by creating a domain (mysite.com and in mysite.com provider I set it to use my dns), creating records from DNS manager (automatically) and checked right values (server IP and my dns names ns1.mysite.com and ns2.mysite.com on NS tab with pointing to server IP).

But, analyzing DNS (ns1.mysite.com) with http://network-tools.com, I get:

Retrieving DNS records for ns1.mysite.com...Attempt to get a DNS server for ns1.mysite.com failed: Timed out

and I cannot figure out how to get DNS server working.

Any help?

thanks