Usually, this message means that the cluster is not currently accepting connections 
You’ll usually see this message around downtime (between 11:00 and 12:00 UTC) when the server is taken down daily for a quick restart and some database maintenance.
It’s displayed when the server is up and online, but we’ve restricted access to it while we’re checking that everything is working fine.
Generally, you’ll only see this message when the cluster is in VIP mode for startup checks after a deployment, but I’ve seen it happen in the past when we’ve had issues with our login system too.
We haven’t had any issues with our login system for a while now, so you’ve more than likely been trying to connect when we’ve been in VIP, or right after downtime when the cluster is still starting up 