Public bug reported:
The default timeout for TCP connections on port 53 to named/bind9 is 300
seconds. The upstream ISC build of bind9 uses this and honors an
overrides you set in the config files.
The Ubuntu packaged version of bind9 seems to hold idle connections
forever, eventually exhausting the allowed open socket limit and
refusing to service any more requests. This is reproducible on all of
our 20.04 hosts.
lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Package Version: 1:9.16.1-0ubuntu2.4 500
** Affects: bind9 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1909950
Title:
TCP connections never close
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