[dns-operations] The Python 3 socket.getaddrinfo() Case Sensitivity Problem

[Florian Weimer]

> TLDR: I applied some OS updates and now can't reproduce the problem. Sorry
> to be saying this, not sorry to see the problem gone. If it comes
> back, I'll spend some more time tracking it down.
>
> That is a locally minted TLD, and for the record there is a searchlist
> which ends with a wildcarded _valid_ domain, hence a valid IP4 address
> rather than NXDOMAIN (but not the correct one); it's trying to resolve
> the address of a machine hosting Redis internally and that's what the
> Redis Python client's code looks like. The actual name in the zone
> file is uppercased ("SOPHIA") and dig returns it as "SOPHIA.m3047".

Which operating system is this?  Has it NSS?  What does the hosts line
in /etc/nsswitch.conf say?

Thanks,
Florian