WOL from WDM 4.8.5 doesn't work (no magic paket sent)

WOL from WDM 4.8.5 doesn't work (no magic paket sent)

Wake on LAN doesn't work in our WDM 4.8.5 installation. Network monitoring on WDM Server shows that no magic paket is sent on UDP port 16962 when trying to wake up a device from WDM console on WDM server. Doing the same job with a freeware tool on the WDM server works (thin client starts, sent magic pakets are captured in network monitor).

Any hints for me on this issue?