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Cannot nslookup the DNS server from client pc !

Dear Friends ,

I have to succesfully configure DNS server in RHEL 5 server . I can test it using following command :

[root@server ~]# host server.example.com
server.example.com has address 192.168.0.244
[root@server ~]# host 192.168.0.244
244.0.168.192.in-addr.arpa domain name pointer server.example.com.
[root@server ~]# cat /etc/resolv.conf
nameserver 192.168.0.244

But the problem is , I cannot dig or nslookup my DNS server from the client pc . I have to set my DNS server ip as client's DNS ip . But still I cannot "nslookup" my DNS server . Is there any further configuration make for this reason in Redhat Ent. Linux 5.0 ?

what is the output of

Code:

iptables -vnL

Your firewall could be blocking the client access