ArcGIS Online, cloud-based mapping platform, is currently down due to the Amazon S3 US East 1 servers outage. This impacts ALL your work related to and stored on ArcGIS.com as well as our UD Campus Map, which will be unavailable until ArcGIS Online services are restored.
For updates visit, please visit http://status.arcgis.com/
Esri is aware of the issues and diligently working on fixing the issues since 12:40pm EST.