I am installing an Epson TM T70 thermal printer with an ethernet interface at our office and trying to forward two ports in the router to make it accessible publicly and be able to print from the web.
I forwarded two ports to the printer's 80 and 9100 ports, but I can't make it accesible. The 80 is for the web interface of the printer and the 9100 is the one used listening print jobs.
I think that the problem isn't at the router, because I can forward a port to a local web server without any problem.
I hope that I had explained myself specific enought to understand the problem, otherwise I can provide any detailed informating.