I had this same problem. Everything worked fine, then I bought a new router because the old one melted down. Same model, same configuration. When I started up again, I couldn't get to my NAS. My wife could no problem but I could not. After a lot of monkeying around I finally turned off UPnP on the router and all was well. Worked for me. Now to try to get this dang DLINK wireless printer server connected *** argggghhhhh ****.