If your router will not allow for forwarding to the broadcast address, then you need to make sure it has the mac in its arp table. Are you sure this tool uses UDP 9? Other tools use for example 65535, or 2304 That magic packet has to be sent to the specific mac. When your machine is off, its not going to answer to arps. So if you local network is say 192.168.1.0/24 - the broadcast address would be 192.168.1.255 Normally for routers to allow WOL from outside you would forward to the broadcast IP of your local network, not all routers support this.
But if you machine has been off for any time at all, the routers arp table will no longer have the mac for that IP address.
Where you run into trouble with trying to do WOL from across the net, is does your router know the mac of your machine? You can forward to an IP all day long.
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