No SRV record found for: _xmpp-server._tcp.newmain.test.com

No SRV record found for: _xmpp-server._tcp.newmain.test.com shown in the openfire debug log,

it occurs when I try to send message to a user in another openfire server.(Server to Server)

How to add a srv record ?

I am a totally freshman about SRV record,could someone tell me how to add a srv record in Centos.

I have installed webmin.

Any answer would be appreciated.

Thanks in advance.