In EM, go to the Web Services > Web Service Endpoint of an ADF BC Service and click the Configuration tab. Note that "REST Enabled" is False but that the administrator can select True.
Apply the change, and then (following EM's direction) shutdown the application ...
Now try to start the application -- won't start. Unfortunately, EM won't allow you to set the REST Enabled boolean back to "False" for a stopped application. I redeployed the application (which set REST Enabled boolean back to "True") and worked again.
Is this expected behavior? If ADF BC 11g Services doesn't support REST, is there a way that the EM config setting could be greyed. Or is the issue more subtle?