IP, MAC or Broadcast entry not valid when performing Wake On LAN

IP, MAC or Broadcast entry not valid when performing Wake On LAN

I am getting this message on all computers when I try to use wake on LAN. I am demo-ing the product. When I first installed I tested a couple machines and it was working fine. Now nothing is working.
 
I verified the MAC addresses are correct.
 
There are very few conversation on the subject.
 
My version is 80026.

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