NDC:
The rndc listening port is listened to by named. rndc is a remote control program for BIND. If BIND/named isn't running, there's nothing listening for a connection from rndc.
In the case of "service --status-all", rndc is being called to check the status of named.
Becuase named wasn't running, there was nothing there
for rndc to connect.
Hope this Helps,