[CentOS] rndc start fails with "rndc: connect failed:connection refused"

>> 	Also in the steps you have taken above you are stopping bind
>> 	via rndc stop and then trying to start it with the unknown
>> 	"start" command.  Even if "start" was known it would not work,
>> 	rndc communicated directly with named, and since it was already
>> 	stopped in a previous step there is no way that your "start"
>> 	(or any other command, reload, flush, whatever) could work at
>> 	that point.
>>     
>
> That would explain a lot but it would have been more useful if the
> rndc command had returned an error saying something like "start
> command unknown" rather than accepting the command and indicating
> a communication problem.
>
>   


So file a bug with the BIND developers about this rather obvious 'bug'.