Confusion about secondary DNS on RedHatAs3.0

Article Title: confusion about secondary DNS on RedHatAs3.0. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Primary DNS address: 192.168.176.11 [pridns.mydomain.com]
Secondary DNS address: 192.168.176.33 [ns3.mydomain.com]
　　
If you directly copy/etc/named. conf of the primary DNS [192.168.176.11], it is okay to start the DNS service,
[Root @ ns3 root] # sftp root@192.168.176.11:/etc/named. conf/etc/named. conf
...........
[Root @ ns3 root] # netstat-tal
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
Tcp 0 0 192.168.176.33: domain *: * LISTEN
Tcp 0 0 localhost. locald: domain *: * LISTEN
Tcp 0 0 localhost. localdom: rndc *: * LISTEN
Tcp 0 0 localhost. localdo: 32772 localhost. localdom: rndc TIME_WAIT
Once changed
.......
Zone "mydomain.com" IN {
Type slave;
Masters {192.168.176.11 ;};
File "named.mydomain.com ";
Allow-update {none ;};
};
.............
The DNS service cannot be started,
[Root @ ns3 root] #/etc/init. d/named restart
Stopping named: rndc: connect failed: connection refused
[FAILED]
Starting named: [OK]
[Root @ ns3 root] # netstat-tal
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
Tcp 0 0 *: ssh *: * LISTEN
　　
What exactly is this?
　　
Configuration of the primary DNS [192.168.176.11]/var/named.mydomain.com
# More/var/named/named.mydomain.com
$ TTL 86400
@ In soa pridns.mydomain.com. root.pridns.mydomain.com .(
2004051200; Serial
28800; Refresh
14400; Retry
3600000; Expire
86400); Minimum
In ns pridns.mydomain.com.
In ns ns3.mydomain.com.
　　
Pridns.mydomain.com. in a 192.168.176.11
Ns3.mydomain.com. in a 192.168.176.33