Hello!
After receiving several reports of users being unable to connect to the Expert Server, we did some additional digging and found something that might be the root cause of it. It was a minor change we did at the same time that we redeployed Casual & Training and should not given this effect. But for some yet unknown reason, some of you had issues connection.
We’ve now reverted the change but it can take a short while for it to take effect.
Sorry about this!