Greetings Citizens of Rubi-Ka. All dimensions are down at 4:40pm GMT/18:40pm CET/12:40pm EST due to the problems with Shadow Knowledge in the Shadowlands. The dimensions will be brought back online as soon as the problem has been fixed.
We apologize for the inconvenience and thank you for your patience.
It appears the new Inferno quests are (I'm told) giving negative Shadow Knowledge, and so are in need of a fix. There is no current ETA on the revivial of the servers, but we will keep you as up-to-date as is possible.