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Wake-on Lan works only when the workstation has been shut down recently

We need to wake-up workstations for several reasons, and notice swe could not get a lab of IBMs to startup. However, if we turn these machines on manually and then turn them off again, they seem to respond to remote WOL. If we leave them for a while they stop responding to WOL. We thought maybe some power management activity was happening that left the NICs or other components unresponsive while PCs were running, which then continued into a subsequent shutdown, but we could not find any power management settings that would cause this. Any Ideas?
1 Solution
Did you check the BIOS settings?  What are the computer make and models?
Most likely for a short period of time after it's shutdown, the system is on soft-off state i.e. ACPI G2 state, with power sitill reserved for the network card.

Some time later, perhaps the system is going into mechanical off state (ACPI G3 state),  or components that need to be powered for WOL to work have discharged.

WOL will not work unless a sufficient amount of standby power is present, and among other things, the network card needs to have standby power applied to it.

Wake on LAN possibly works in ACPI system states G1, G2, S1, S2, S3, S4.
But will not work in when the system is in G3 state.

In general: you need to check your BIOS setup menu, that you can access while booting the system.

Make sure that Wake on LAN is enabled,  make sure any "Wake on LAN from standby"  option is enabled,  so the system reserves power for the network card.

There may be additional system wakeup/standby power/input options you need to turn on.. i.e.  more of the "Wake on LAN from Keyboard/Modem/LAN"
options may need to be on than you have turned on.

These are often disabled by default to avoid consuming extra power in standby mode.

quiet_treeAuthor Commented:
Thank you
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