WOL problem?

I can get WOL to work if my computer is connected to my other computer. Problem occurs when I'm trying to send magic packet to other computer via Network or internet.
I am using the correct :
Mac Address
ip of my computer that I want to wake.
Subnet mask
port no.
The port is forwarded correctly via Router.

What else am I missing here?
Thanx in advance
Runc

No takers?