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So you need to open up some ports in your firewall for your network printer.

Well almost all network printers use the same ports.. so far from what I’ve seen they all use:

port 515, Prints to destination port 515 in LPR mode
port 721-731, LPR (RFC 1179 Compliant)
port 9100, Source ports from ephemeral ports (9100 default)

So if you need to open some holes in your firewall for printing purposes remember the destination ports to open are 515 and 9100. If that doesn’t get it also open 721 through 731