I've read the previous threads about this situation, but mine is a bit unique and I'm not sure what's happening. For the longest time I was running an old dlink wifi router that wasn't password protected and this is when the user first showed up. Obviously it was because I wasn't protected. I ended up putting in a password and he went away for a bit. I recently bought a dual-band netgear router and after a week or two it showed up again. I can't connect to it, the usual "connection failed" with the "connect as" option... I have a shared folder on my network so I can read files from my apple tv, so I'm wondering if he (I say he, because the computer is labeled as "davenel***lapto" [stars to keep his identity somewhat hidden]) is taking files from my shared folder. The new router is password protected with the password that came set up with my router which seems tight (a much more unique default password than I've ever experienced before) but I can't figure out how this computer keeps connecting to my network. All other pcs/macs on my network are accounted for. Any tips as to how to keep this from happening? It seems like changing my password won't help because even after a new router with a different password he can get in.