We have a customer that needs us to set up a printer for TCP printing with bi-directional communication. I tried to set up an IPP printer but it fails to print. He is printing on port 9100. Since the IPP printer uses port 631, should he change the port? Can someone please explain if this is possible? When I setup NAT to forward to this printer, our customer can communicate with the print server but is still unable to print. I am temporarily running without filters so this is not an issue at this time.