IMac/Mavericks won't Wake for Network Access

I just migrated to a 3TB Fusion drive iMac and it will not awaken when the network Apple TV tries to load the iTunes library... on WLAN
Energy Saver/Wake For Network Access is checked
I even UNchecked Put Had Disks To Sleep
Computer Sleep 1 hour /Display Sleep about 5 minutes
This worked before on my previous iMac/1TB/Lion on LAN
Any ideas?  (Other than setting Computer Sleep to NEVER)
Is it because I'm on wireless now?  :-/  Does "Wake" require a LAN connection?

Hi,
I have the same problem. I have also checked the settings as described.
It is really annoying that if I want to use my new Apple TV to stream from the iMac, I have to go upstairs and wake it up first.
My wireless network is via a Sagem router using Channel 2 and 802.11g.
Generally wireless network access is just fine.
Problem is just that the iMac won't wake from sleeping.
Could any installed software be interfering?
John.

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