App Inventor Down?

My class is attempting to connect (as am I) and everyone is stuck on "Establishing Secure Connection" / "waiting to get blocks"

It is at your end....

Is this a recent change or is this your first time using App Inventor in the classroom?

It is worth having your school IT look at this document to ensure that the network is configured correctly to support the peer-to-peer connections MIT App Inventor needs to work: