[Pdns-users] Recursor: Error writing TCP answer - broken pipe

[Remi Gacogne]

Hi Christoph,

On 16/01/2022 11:27, Christoph via Pdns-users wrote:
> I get about 2000 of these log events per day:
> 
> pdns-recursor[11727]: Error writing TCP answer to 109.70.100.132:31192: 
> Broken pipe
> 
> 109.70.100.132 is the IP address of an dnsdist instance.
> 
> setup:
> DoH/DoT clients -> dnsdist -> recursors
> 
> Is there anything that can be optimized to avoid these errors?

My guess is that the initial client closed its TCP connection with 
dnsdist, leading dnsdist to close its TCP connection to the recursor as 
well. 1.7.0 might do a bit better in that regard because it reuses 
outgoing TCP connections more aggressively when possible, but the real 
fix might be to lower the severity of that log message in the recursor.

Best regards,
-- 
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/
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