DNS/named-9.11.1-P3/rndcについて、ここに記述してください。

$ rndc flush

rndc: connection to remote host closed
This may indicate that
* the remote server is using an older version of the command protocol,
* this host is not authorized to connect,
* the clocks are not synchronized,
* the key signing algorithm is incorrect, or
* the key is invalid.

control interfaceは動いた。

28-Jul-2017 09:35:09.920 invalid command from 127.0.0.1#46095: bad auth

権限がないか。