Wake-on-LAN (WoL) is not waking up machines.
All supported environments of GFI LanGuard with Wake-on-LAN (WoL) enabled for scanning machines.
After the machines are added to GFI LanGuard manually by either Name or IP address, GFI LanGuard needs the machine’s MAC address for Wake-on-LAN (WoL) to function.
After adding machines to the GFI LanGuard interface, run a scan against those machines using the System Information scan profile to collect the MAC address. It is recommended to use the System Information scan as it is the fastest of all available scans.