We are having some issues with KML downloads on our Hub/Open Data site. We noticed a few layer where users can download shapefiles and csv, but if they try KML they get "an error has occurred".
The same data can be downloaded as KML on the ESRI hub site
The layers in question include those hosted on our servers and those on ArcGIS Online.
I did not see any errors in the server logs on the layers we host