I am currently managing approx. 30 Intel AMT-enabled boards (DQ77KB), running (various versions of) Windows
Querying and setting their on/off state (using the WSMAN interface) works. VNC works as well.
However, after some period of time, these boxes stop responding - I get no reply from the management interface at all.
It can take as little as 5 minutes, or as much as 5 days, for the problem to manifest.
As a workaround, I added zabbix warnings and manually power-cycle the unresponsive boards.
This morning, 28 boxes were down, resulting in a massive loss of service (and a few of my managers getting angry at me)
I tried searching the forums to no avail, with most of the questions left forgotten or unreplied.