You can prevent all users from connecting their devices to the Mobility system, and then allow access when you are ready. This is helpful when you are installing an update to the Mobility Service software.
In the Mobility Admin console, navigate to Config > Device to display the Device Sync Agent configuration.
Deselect Enable in the Allow Connections setting.
Click Save to save the new setting(s).
Restart the Mobility Service:
gms restart
When you are ready to allow access again, select Enable in the Allow Connections setting, and then restart the Mobility Service.
NOTE:Whenever you block or unblock a device, notify the device owner of the change in device status.
Occasionally, you might encounter synchronization problems with specific users or devices. For example, a problem with a specific user or device might start to consume an inappropriately large amount of system resources on your Mobility server. If this occurs, see Blocking/Unblocking Specific Devices for assistance with resolving the problem.