This article explains why after a bare metal restore, the client can ping the DPU and the DPU can ping the client but the DPU cannot confirm the client.
The Bare Metal restore completes successfully but you can’t do a file level restore and the DPU can’t confirm the client because the Unitrends Agent will not start. The Unitrends Agent will not start because it was installed on a drive other than the C: drive and the Bare Metal restore only restores the C: drive.
To restore this error:
Uninstall the Unitrends Agent and then reinstall it on the C: drive. Once that is completed, re-confirm the client and then perform the file level restore. If you cannot remove the agent then you can use Microsoft’s Fixit Program here: http://support.microsoft.com/mats/Program_Install_and_Uninstall.