After adding an MDM Server, you can test its outbound connectivity by clicking Test Certificate while configuring the Apple Push Notifications service (APNs) or by clicking Test API Key while configuring Google Cloud Messaging (GCM). If the configuration is valid, both these options will test connection to APNs and GCM respectively, from each of the MDM Servers. If connectivity fails from one or more MDM Servers, the failed servers would be listed. You can perform these actions in the respective push notifications configuration sections of ZCC. For details, see Enabling Push Notifications.
NOTE:If any ZCC operation involving MDM Servers fails, check the zcc.log, services-messages.log, and the loader-messages.log.