Error message "The adapter operation was aborted" displaying on Content Hub (../admin/content/acquia-contenthub) for Drupal 8 sites on Acquia Cloud Site Factory.
The Content Hub Discovery UI is an Ember JS app which reaches out to the Content Hub service to get the displayed entities. This error is generally caused by something blocking the page from getting to the service.
Enable CORS following instructions.
If already enabled, you may have to whitelist the Content Hub service URL.