Yes that exactly, essentially we found that we had the connections set
to 1000 and one client opened a few connections but they never closed,
they then opened more and more naturally.

In the end one client had over 900 connections. Once we hit 1000 we ran
a quick dig against the server and it failed/timed out.

Although now that I think about it, to get BIND to run after compilation
because it wanted to wite log files into /var/log I disabled apparmor
temporarily and that allowed the write.

I have no tested the packaged bind without apparmor, I can't imagine
apparmor forcing bind to hold TCP connections open though, it was
however one difference between the two versions of bind being run.

Just for comparison none of our Debian or CentOS or Fedora boxes exhibit
this issue.

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https://bugs.launchpad.net/bugs/1909950

Title:
  TCP connections never close

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