Domains cannot resolve after cpanel installed
I've just installed cpanel/whm in my centos 6.5
But i can't reach my domains.
I've set my hostname to "server1.mydomain.com"
"mydomain.com" does not work but https://mydomain.com:2083 works.
And i've added a new account with it's domain was set on the main domain of cpanel "mydomain.com". then newdomain.com does not work and https://newdomain.com:2083 is working!
Another problem is that when i want to access to the : "newdomain.com:208" it will redirect me "https://server1.mydomain.com:2083/"
The dns is approved and works fine.
I want to know why it can't show me the cpanel welcome page!
Can anyone help me?