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

[Tony Finch]

Rob Moser <Rob.Moser at nau.edu> wrote:
>
> Which a little digging shows me is often the result of network
> connectivity problems, firewall misconfigurations, etc.  But in our case
> the failures are intermittent (but frequent; roughly 40% of our zone
> refreshes seem to end this way.)

Have you made sure there is no connection tracking / stateful packet
filtering configured on port 53?

Tony.
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