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If the issue is happening on all systems only when turning them off remotely, the issue has to be related to the way the provisioning has being configured.
I would recommend checking the following manuals and links:
AMT utilizes low level hardware commands to perform its power control functions. This has the advantage that AMT commands will still function even if the operating system is in an unhealthy state. The disadvantage is that power functions such as reset will immediately reset the system (it will not prompt the user to save work, etc). This is why windows is showing the unsuccessful shutdown error.
One way to avoid this is to utilize windows commands to shutdown or restart the remote machine. For example, there is a 'shutdown' command and can shutdown a remote PC included in windows (see: http://support.microsoft.com/kb/317371). If your OS is in a good working state this will allow windows to shutdown correctly. If the system is not is a good working state and fails to shutdown, you can use AMT to force a shutdown.