Similar to Windows Vista, the operating system of the game server is nearing it's EOL. As such, I'll perform an upgrade to the current Long Term Support version on the game server tomorrow, April 28, 2017 at around 10:00 CEST (which is around 1am Pacific time). It is expected to last around 30 minutes.
During that time, you won't be able to access the game (but you should be sleeping anyway! ;P).