Cannot get online through wifi or usb Ethernet on MBA

All of a sudden my MacBook Air is not letting me access safari. It says I'm not connected to the internet.

At work I've been connected via Apple's usb Ethernet adapter. It's worked for months. Then suddenly this week, it stopped working.

Also, at home while connected to my wifi network, the same issue occurs.

In both instances, I am able to receive email and connect to system updates. I have a green light in network preferences., showing I am connected.

Anyone have a clue as to what would cause this strange and sudden issue!!!!????