Bind suddenly starts responding clients with servfail

Søren Andersen SOAN at
Fri May 8 21:27:35 UTC 2020

Hi Greg,

I'm glad what I'm not the only one having this issue. Currently i've not more information that are not already mention in this mail thread.

But do you have a link to the ticket you have created?

From: Greg Rivers <gcr+bind-users at>
Sent: Friday, May 8, 2020 04:03
To: Søren Andersen <SOAN at>
Cc: bind-users at <bind-users at>
Subject: Re: Bind suddenly starts responding clients with servfail


On Monday, 27 April 2020 03:59:39 CDT Søren Andersen wrote:
> I'm running a few BIND servers, but lately one of my servers suddenly starts
> responding to clients with servfail for every request from the clients, and
> BIND doesn't respond to the rndc or statistics interface anymore.
> My logs for client-channel show me this:
> 25-Apr-2020 21:52:04.501 client @XX XX.37#2921 ( no more
> recursive clients (1000/900/1000): quota reached
> I've removed all the dns traffic from the server, and the quota is still
> reached after 6+ hours?
> Do you guys have some clue what all this is about? - Or any suggestions
> where to look for any further information?
> I'm running BIND 9.16.1 on CentOS 7:
I've had the very same thing happen twice in the past two weeks on different production recursive servers running BIND 9.16.2 on FreeBSD. I've opened a ticket with ISC, and they are looking into it. Can you share any additional information that might aid troubleshooting?

If anyone else experiences this, please report it.


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