What I mean by WEP/WAP is the security setting, do you've it setup on the router? These are wireless security protocols that help secure wireless networks but seeing that you're not using the router wirelessly. You seem like you know what your doing so, I'll ask if all your computers are in the same workgroup same ip range and subnet?? Have you enable the printer to shared on the network?Also if you haven't taken a look at your firewall setting look at that, sometimes they are the problem. Let me know OK