Wifi ISP fails

I have a problem with my 2012 MacBook Air running 10.10 Yosemite. It will connect to the wifi router fine - even shows me other computers on the home network so I have a network connection however the ISP, Internet , Server all show failed (red) in the diagnostics.  My router is a Linksys WRVS4400N enterprise router firmware 1.1.13.
Before upgrading to Yosemite I never had this problem when I was running Mavericks. I left the country for several months and upgraded to Yosemite while I was away. When I returned I could never connect to the internet using wifi - using ethernet is not a problem - it works fine.
So I sold my first Macbook Air and bought another 2012 model and it has the exact same problem - new clean install of Yosemite.  I have searched far and wide and yet to find an explanation or a fix. There is a litany of proposed solutions none of which have worked.
I will note that the first MacBook Air connected to another network without a problem - the new one I have yet to check outside my own network.
When running the diagnostics in the Network Settings the ISP and Internet indicator lights might flash to green momentarily as if it resolves its problem but then reverts back to red (failed) very quickly.

Hello backinmac,
Welcome to the Apple Support Communities!
I understand that you are having Wi-Fi connectivity issues on your MacBook Air running Yosemite. I know that you have already completed a lot of troubleshooting as well. In this situation, to make sure all bases are covered, I would suggest working through the troubleshooting steps in the attached article. 
Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
Another article that may be useful in your situation is the next attached article. It will help explain the Wireless Diagnostic Assistant and its results. 
About Wireless Diagnostics - Apple Support
Have a great day,
Joe

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