I'm located in Belgium.
My ISP is Telenet and I have a Motorola / SBV5120E (DOCSIS) model.
Not that it matters, I guess.
What I now have discovered:
When I send the WOL magic package, right after I shutdown my server, it works.
But when I wait for more then 5 minutes, I'm unable to wake my server.
I't seems that the router does not know how to forward the WOL package after the ARP table gets flushed.
In the log from the router I read: 'Per-source UDP Flood Attack Detect (ip=213.119.x.x) Packet Dropped'.
The IP is from my iPhone.