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I recently noticed, that Pleroma is not restricted to localhost, but is listening on all network interfaces.

sudo ss -tln | grep :4000
LISTEN    0         128                0.0.0.0:4000             0.0.0.0:*

I guess there are currently many exposed port 4000 in the Fediverse.

If Pleroma is keeping the current behavior, then I would need to add a firewall configuration section to the installation guides.