This started happening just a few weeks ago out of the blue. Wired or wireless, it doesn't matter. I've got a macbook pro and a windows HTPC computer on a network that I'm trying to send files back and forth between. I do have File Sharing turned on both computers. I've set IP addresses and subnet masks for both computers as well. The windows box shows up on under shared in Finder, but when I go to connect it'll either say "connection failed" or it will ask for a login, at which point, no matter what I put in, it will immediately say failed. If I try to mount it manually in Terminal, I get a "broken pipe" error. AFAIK I haven't changed network settings on either computer to make this happen. Could this be a windows or a mac issue?