I have a problem with the configuration of the domain name on a vps server

My server ip is 198.211.123.197

I create a hosts with my domain name:

NS1.so-l.net 
NS3.so-l.net

PING NS1.so-l.net (198.211.123.197) 56(84) bytes of data. 
64 bytes from So-l.net (198.211.123.197): icmp_req=1 ttl=55 time=18.7 ms 
64 bytes from So-l.net (198.211.123.197): icmp_req=2 ttl=55 time=18.8 ms 
64 bytes from So-l.net (198.211.123.197): icmp_req=3 ttl=55 time=18.7 ms 
64 bytes from So-l.net (198.211.123.197): icmp_req=4 ttl=55 time=18.7 ms

and

PING NS3.so-l.net (198.211.123.197) 56(84) bytes of data. 
64 bytes from So-l.net (198.211.123.197): icmp_req=1 ttl=55 time=18.6 ms 
64 bytes from So-l.net (198.211.123.197): icmp_req=2 ttl=55 time=18.8 ms 
64 bytes from So-l.net (198.211.123.197): icmp_req=3 ttl=55 time=18.8 ms 
64 bytes from So-l.net (198.211.123.197): icmp_req=4 ttl=55 time=18.7 ms

I configure my domain so-l.net to this dns:

• NS1.so-l.net
• NS3.so-l.net

So now, whois so-l.net :

Domain Name: SO-L.NET

   Registrant:
   on line marketing

   Domain servers in listed order:
      NS1.SO-L.NET
      NS3.SO-L.NET

Great, I installed webmin and BIND DNS Server and i configure the domain name but it doesn’t work… ( i Create master zone, and did all that i found on the interenet… and nothing:

ping so-l.net
Unknown host: so-l.net	

Please i need help, here is named.conf:

// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
        listen-on port 53 { 127.0.0.1; };
        listen-on-v6 port 53 { ::1; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        allow-query     { localhost; };
        recursion yes;

        dnssec-enable yes;
        dnssec-validation yes;
        dnssec-lookaside auto;

        /* Path to ISC DLV key */
        bindkeys-file "/etc/named.iscdlv.key";

        managed-keys-directory "/var/named/dynamic";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

server 198.211.123.197 {
        };
zone "so-l.net" {
        type master;
        file "/var/named/so-l.net.hosts";
        };

Here is /var/named/so-l.net.hosts:

$ttl 38400
so-l.net.       IN      SOA     so-l.net. mctomp.gmail.com. (
                        1363523481
                        10800
                        3600
                        604800
                        38400 )
so-l.net.       IN      NS      ns1.so-l.net.
so-l.net.       IN      NS      ns3.so-l.net.
so-l.net.       IN      MX      10 mail.so-l.net.
so-l.net.       IN      A       198.211.123.197
ns1.so-l.net.   IN      A       198.211.123.197
ns3.so-l.net.   IN      A       198.211.123.197

Please help,

Thank you.