Wake on Lan works from LAN but not WAN

These describe the situation:

• 
  

  I believe the packet is being properly forwarded from the WAN to the LAN host, because WoL Magic Packet Sender utility displays a message the packet is received whenever I send from the WAN or LAN.

  
  


• 
  

  WOL works perfectly from inside the LAN. If I send the packet from
  another LAN computer, then the computer wakes up from a powered off
  state as it should.

  
  


• 
  

  WoL does not wake the computer from the powered off state when the
  packet is forwarded though the router from the WAN.

  
  

Router is a Dlink DIR-625, target host is a Windows 7 x64 computer on a Big Bang Xpower moboard.

And I reiterate: the packet shows it is being received from the WAN with the computer on, but the packet only turns on the computer when the packet originates from inside the LAN.

Answer

You could try going into 'Network and Sharing Center'

click on your connection

Click 'properties' in the dialog box

in the dialog box that pops up, click configure

Untick "only allow a Magic packet to wake the computer"

Click ok