The direct tile access to MapQuest legacy maps was discontinued. Now we require a sign up for a plan on the Developer Network.
How can I configure the MapQuest account in other to use it in the ckan platform?
Now I have a message in all my ckan sites instead of the map image.
For widgets provided by ckanext-spatial (spatial search and dataset extent) or ckanext-geoview you can use these configuration options.
For the Recline viewer these options will be available in the next release, in the meantime you can patch your recline.js file as in here: https://github.com/ckan/ckan/pull/3174