The game server will be taken down at about 1:15am 6/20/2017, Central Time, for some OS upgrades at the data center. Estimated downtime is 30 to 90 minutes. (Can't give you a better window than that, sorry.)
Actual upgrade will occur at 1:30am and, at that time, both the game and website will be down.
Apologies for any inconvenience this may cause anyone.
11:15pm 6/19/2017 Pacific Time
2:15am 6/20/2017 Eastern Time
6:15am 6/20/2017 GMT