refresh_nft_cache: mnl_cb_run returned -1: Protocol error endlessly spammed in log; UPnP rule listing does not work

[AshleighTheCutie]

As the title says. It's unable to show clients that can display the mappings that are currently active, but everything else works. However, I can't reliably trigger this behaviour now - somehow restarting MiniUPnPd fixed it?

[miniupnp]

"Protocol error" is EPROTO.

I don't understand how this can happen :)

[miniupnp]

@AshleighTheCutie have you reproduced the problem ?

[AshleighTheCutie]

Not yet, still trying to.

[phanirithvij]

I have a consistent reproducer but it is on nixos.

You can reproduce it via

nix \
  --extra-experimental-features nix-command \
  --extra-experimental-features flakes \
  build nixpkgs#nixosTests.upnp.nftables -L