Seem to be getting this all the time at the moment, on version 514.1566. Can't connect to games at all.

The BYOND Hub is currently unreachable. Some functionality will be unavailable.
The hub is verified up and running. Either it was a transient issue or it might be a problem with your ISP.
I'm getting this issue too. And I've never had it before.
Had to manually redownload and install the entirety of byond.