If you uncheck the box for Wakeup Devices does the task behave any differently?
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If the option wakeup Devices is unchecked, the behaviours were still the same.
We finally decided to upgrade the server with the SP3 and at the same time upgrade the networks card drivers on our machines.
Now everything seem to be working fine. If a machine is not reachable, the task do the job correctly and list all unreachable machines in the failed result.
Thansk for all !