I think Dan's summary above is very good. For clarification I would add
a couple of points.

The issue is not just remote logins. xdm behaves in the same way, and
the absence of a systemd-logind session may mean that sound is then
unavailable to the user logged in at the console. (Mentioned to help
people searching for local sound issues.)

Comments 12 and 16 of bug #1915502 also mention ProtectHostname=no which
I don't understand.

My understanding of nscd is that, even on cache misses, it will perform
the lookup itself, and, being a separate process outside the systemd-
logind sandbox, it will succeed. I am not convinced that mandating the
use of nscd would be a good idea though, especially as some
distributions are moving away from it, e.g.
https://fedoraproject.org/wiki/Changes/RemoveNSCD  I suspect a lot of
NIS/LDAP users do use some version of nscd, which is why there are not
more people caught by this issue.

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https://bugs.launchpad.net/bugs/1934393

Title:
  systemd-logind network access is blocked, and breaks remote
  authentication configurations

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