go-wol has stopped working

[jimmypw]

Having used this WOL tool successfully for quite a long time now out of the blue it has stopped working and I can't figure out why.

I run the command from a shortcut on my desktop that links too.

C:\Users\me\Documents\wol_windows_amd64.exe wake 1c:6f:65:xx:xx:xx

Which provides the response

Attempting to send a magic packet to MAC 1c:6f:65:xx:xx:xx
... Broadcasting to: 255.255.255.255:9
Magic packet sent successfully to 1c:6f:65:xx:xx:xx

But the device doesn't wake.

I am certain everything is set up correctly as triggering the WOL packet from pfsense works as expected.

Have you got any pointers / things to check?