From ProQuest (we subscribe to Ebook Central, formerly known as Ebrary)
Dear Valued Customer:
To maintain the currency and security of ProQuest ebook platforms, Ebook Central … will be unavailable for approximately five hours beginning Saturday, December 2, 2017 at 1 p.m. Eastern Standard Time.
Down times around the world:
United States (EST): Saturday, 2 December, 1:00 p.m. through Saturday, 2 December, 6:00 p.m.