This issue was caused by a scheduled upgrade and has been resolved.
Posted about 1 month ago. Aug 08, 2017 - 18:45 PDT
We’re currently monitoring the situation that led to the Classroom outage this morning. Students may experience slower-than-usual load times for classroom.udacity.com. We apologize for the inconvenience, and will update here as new information becomes available.
Posted about 1 month ago. Aug 08, 2017 - 15:00 PDT