After updating to Yosemite, the ethernet connection is down

Hello,
Since the upgrade to Yosemite, the ethernet connection is down.Unable to connect to internet with my ethernet cable.
If I connect the same cable to my other mac under Maverciks, there is no problem.
The wifi works fine
I have an iMac 27-inch Mid 2010
Thank You

I have a similar problem on my iMac 27-inch Mid 2011. No problems before upgrade yesterday to Yosemite. System settings show positive connection for wifi and ethernet. But web & mail access doesn't work for ethernet. Wifi access works only if I change service order with wifi listed before ethernet.
Apple phone support blamed it on my internet provider or router. However, our 2nd iMac (identical model) has web & mail access with ethernet. The other iMac is still running Mavericks. So the problem is clearly Yosemite.
I have put in a request for Apple support to call me tomorrow, & I'll see if they try the blame game again.

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Not enough free storage space can slow your Mac down.
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After updating to Yosemite, the ethernet connection is down

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