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This article describes the causes and solutions for 404103 DeviceNotOnline errors.
Symptoms
A direct method to a device fails with the error 404103 DeviceNotOnline even if the device is online.
Cause
If you know that the device is online and still get the error, it's likely because the direct method callback isn't registered on the device.
Solution
To configure your device properly for direct method callbacks, see Handle a direct method on a device.