First Check is there any Firewall enable.
#iptables -L
In that DNS 53 is allowing or not.
If it is not allowing add following rule in /etc/sysconfig/iptables (IN FORWARD )
-A INPUT -m state --state NEW -m tcp -p tcp --dport 53 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 53 -j ACCEPT
#iptables -L
In that DNS 53 is allowing or not.
If it is not allowing add following rule in /etc/sysconfig/iptables (IN FORWARD )
-A INPUT -m state --state NEW -m tcp -p tcp --dport 53 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 53 -j ACCEPT
And then restart iptables
# service iptables restart
now check
# nslookup sample
------ IF still giving the Refused.
Now check on the /etc/named.conf
allow-query { localhost; }
change this to
allow-query { <your-network> ; } ex:192.0.0.1/24
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