it doesn't matter, the firewall cannot be the problem because your on the Lan side of the router and not on the Wan Side (ip adrers is also not the problem, but be sure you set the ip on the printer manually). Wat kind of Antivirus runs on your computer, maybe its blocking it, took a look on it ,and try to disable the firewall setting of the antivirus, en look of it will work then, if ut work you need te make an rule in the software,