I've got an issue with my server that has it sleeping, and there are no settings set to have it sleep.
Under power management, it is set to never sleep.
It will randomly sleep, I believe it wakes to do the server backups, but will sleep until I manually awaken it. I have had lightouts installed, and it will ignore lightsout. That is, with lightsout installed, but disabled, it will still sleep, also with lightsout configured to keep server awake during the client backup scheduled time of midnight to 6am, lightsout seems to wake the server at midnight, but the server tend to go back to sleep @ ~12:30am. Uninstalling lightsout had no effect on the issue either. This started back in April of this year.
Just within the last week, I did a complete fresh install of the server OS on a new SSD drive. This issue still persists, all of the above, with or without lightsout installed are the same.
I am at a loss as to why this is happening, any help would be appreciated. If I need to reinstall, that's fine, that is, if I need to install with different BIOS settings for ACPI (which are enabled, but set to be controlled by the OS).
I don't know what to look for in the event viewer that might pertain to this issue or what to look for that is causing it to go to sleep. What I can find in the event viewer is that when it is asleep, I find the events related to the network adapter waking it up. This is from me using the lightsout client, on a client machine to wake the server.
As for my network adapter, offloads are disabled, and it is set to only wake with magic packet, pattern match is disabled (this is the way the server and all clients have their respective network adapters configured). I can remember when I first installed lights out and having trouble keeping the server asleep and disabling pattern match solved that issue, it ran perfect for a couple of years, but this going to sleep on its own just isn't right and something that makes the server quite useless in having. I mostly want it for client backups, but since it sleeps through the client backup schedule, they don't get backed up. If it happens to be awake at the scheduled time, the clients backup fine.