Intermittent "failure trying master... operation canceled" on zone refresh

Matthew Pounsett matt at
Fri May 18 18:08:59 UTC 2018

On 17 May 2018 at 17:05, Rob Moser <Rob.Moser at> wrote:

> We're running a series of RHEL 7.4 machines (kernel version
> 3.10.0-693.1.1.el7.x86_64) running bind version 9.9.4-RedHat-9.9.4-51.el7.
> Our configuration consists of a hidden master and three hidden
> slave/recursive resolvers.  I'm getting a LOT of errors on the slaves that
> look like:
> 17-May-2018 13:27:28.421 general: info: zone
> refresh: failure trying master (source operation
> canceled
> In addition to checking for firewalls and other stateful network devices
as Tony mentions, you should also have a look at the condition of the
network in between the hosts.  That feels a lot like moderate packet loss,
or extreme latency, to me.

Are these machines all on the same LAN?  Are there multiple networks in
between them?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the bind-users mailing list