My print server runs on a Ubuntu Server virtual machine that is bridged to my LAN and using CUPS. I configured UFW to allow all on port 631 so devices can send print jobs to the printer. Is there a better configuration for that port on UFW?
You could change the rule to either TCP or UDP, whichever it uses. But it won't really matter unless you have some other service running on the UDP port or something like that. If it works I don't see any need to change it.
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