So I decided to look for a better solution. I don't like doing such things because newer BIOS also has other bugs fixed and downgrading may even break something. In Dells forums people recommended to downgrade the Dell BIOS or even to get their mainboard changed to get WOL to work: I don't know what is gouing on there with Dell hardware vs Microsoft vs Intel issues but it has become a nightmare to get simple things to work reliably these days. UPDATE February 2017: Besides the fix described here it might happen that you experience strange problems with your Dells like NOT waking up on WOL or the other way round - "MAGICALLY" waking up randomly for no reason (you see things in Windows log like "firmware" as start reason) - in both cases I recommend updating to latest Intel network drivers (the Dell drivers are often outdated). Reason is, it is extremely annoying that this is the default and it is not clearly documented. Therefore enables Deep Sleep instead of Wake-On-LAN? Whatever the Maybe Dell needs to comply with some power saving requirements and UPDATE: The same behavior is also observed with DELL BIOS A07. Note: At the time of this writing the current Dell BIOS for Optiplex 9020 MT was A05. I finally got this to work and would like to share my experience here. I had very serious problems getting Wake-On-Lan (WOL) to work on my new Dell Optiplex 9020 MT (MiniTower) on Windows 8.1 Pro. HKLM\System\CurrentControlSet\Control\Session Manager\Power\HiberbootEnabled TO DISABLE FAST STARTUP ON WIN 10 THROUGH GROUP POLICY PREFERENCES CREATE THE FOLLOWING KEY: UPDATES (yes, Microsoft does not stop creating nonsense features / IMPORTANT, BECAUSE WINDOWS 10 TURNS "FAST STARTUP" (read below) BACK ON AFTER THIS FIX ALSO APPLIES TO WINDOWS 10, IT IS EVEN MORE
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