I have a Pi that I'm using as a headless music server, running Raspbian, accessed using both MPD and Subsonic. It's been working perfectly for the last month, no issues, but as of this past week I've started being unable to connect. The Pi does not respond to pings, drops ssh requests, and nmap shows all 1000 ports as filtered. I have changed no settings, and have only used the Pi to listen to music, so I am very unsure as to what the issue could be all of the sudden.
I have a static IP assigned by the router, and always check to make sure I'm using the correct IP, so this is not the issue. At some point, rebooting the router allowed me to connect for about 10 minutes, but now even that doesn't work.
Rebooting the Raspberry Pi doesn't do anything to help.