To allow the computer to be powered on lan via a special network packet, you must enable it from the Device Manager.
    To do so :
    
                        First type Device Manager in the Windows Menu:
    
 
                    
                        Then unroll Network Adapters tree item and modify properties of each concerned network adapter:
    
 
                    
                        Then go in the power manager tab and check "Allow this device to wake the computer".
    
