To close this port you could either stop the process which has opened the port, or you could firewall the port. I think stopping the process is probably the idea, as you probably do not need the Internet Printing Protocol. So, I would look to either kill or remove that process. Voila, fixed.
Hope that helps, p.s. 'ps ax' and 'kill' would be useful in this situation.
J.J.E.
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