nameserver not responding

I created custom nameserver with my main domain where my vps server main ip goes.
I registered nameserver with my vps ip address in domain registrar
I restarted my nameserver as well, and now when I am trying add another domain and bby using my custom name server, my domain is unreachable when it's nameserver changed to my custom nameserver

I tried using free DNS ns1.centos-webpanel.com & ns2.centos-webpanel.com but they are not working aswell

anyone here knows something?

Leafdns is also showing positive results

http://leafdns.com/index.cgi?testid=1BCF161E

I know it has been a while but I also ran into the same issue. DNS can take a little while to update but couple things here:

1) is your webserver behind NAT?
In case your server is behind NAT you would have to set your name server using your private IP address.

2) Don't forget to configure both: your loca and public IP in CWP settings in check the NAT-ed settings.