HT201960 Followed instruction - no dice on Wake on wireless LAN, no Back to my Mac

iMac 3.4GHz Intel Core i7
Yosemite upgrade over OS X Mountain Lion.
Ethernet Card: AirportExtreme, Broadcom BCM43xx
Wake On Wireless: supported
However, simply doesn't work. Spent hours trying to solve the problem.
My home router is an Airport Extreme - network is 5GHz 802.11n on channel 149, security is WPA2 personal.
Airport firmware 7.6.4.
tried sudo pmset network oversleep 1 - no success after prolonged sleep.
Can somebody make this work?!
Need help - thanks in advance.
MT

Contact Apple's Support and let them deal with the problem. You have at least one year of free phone/web support.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.1), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

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    Welcome To Lenovo Community
    We are really sorry to hear about the issue you are facing,
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