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Windows: Unattended Sleep Timeout

Problem

A Windows guest running under the Proxmox hypervisor repeatedly powers off despite having the display and sleep settings set to Never . 


Solution

Open a PowerShell prompt as administrator and run the following command to expose a the System Unattended Sleep Timeout setting in the advanced power controls interface.

Set-ItemProperty HKLM:\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0 -Name Attributes -PropertyType DWord -Value 2

Then, open the Advanced Power Settings interface and set the System Unattended Sleep Timeout to 0 .

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