Closing port 631 from other computers

Jarmo Hurri jarmo.hurri at
Mon Nov 3 07:06:26 UTC 2014

Tim <ignored_mailbox at> writes:

> As others have said, you can reconfigure CUPS so that it doesn't listen
> to the outside world.
> As they haven't said, yet, I consider this to be the better approach.
> Rather than rely on something else (a firewall) to get in the way,
> configure services to be more secure, in themselves.
> I can run without a firewall, at all, simply because I don't have things
> listening to the world on my systems.  I don't, because I'd rather have
> two things looking after me, than just one.  But it's mostly pointless.

Makes sense. In fact, after following the other advice in this thread
nmap and "lsof -i" now tell me that the only thing listening on my
computer is cups, and it is only listening to local connections.

Thanks for your help.


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