User blog comment:Rappy 4187/Technical Update: October 19, 2016/@comment-126761-20161021163319/@comment-126761-20161021181937

Unfortunately, there's not a great deal we can do about it - but I'm sure it will get better as the day progresses.

Services are running normally on our end, but you might not be able to reach them. The nature of this issue does mean it could affect things randomly, and I believe that can include Chat.

You may have some success by switching your DNS provider (e.g. to Google DNS) - but it's a bit technical (and comes with risks if you're not sure what you're doing), so don't feel you have to try it.