Wakeup on LAN script works from Mac, but not Windows 7

Wakeup on LAN script works from Mac, but not Windows 7

I have a Linux server on my local network that is set up to use wakeup on lan. I copied this script verbatim, just replacing the MAC address in the example use. When I run this script on a Mac, the server wakes up. When I run it from Windows 7 (32-bit Ultimate) it doesn't do anything (note that the script DOES run, I added a debug raw_input() to confirm).