Yosemite will not maintain an ethernet connection

I have had the same problem since upgrading to Yosemite. I did all of the same things you did. I even blamed my internet provider. I switch off the ethernet connection and am relying on my internet connection via wifi. Not the solution . . . I can use the ethernet connection for awhile if I reboot and/or disconnect the modem/router. But it only lasts for awhile. After a few pages into a site, the progress bar stops about a third of the way across when going to a linked page. All very frustrating. I am hoping that someone will answer this post with a magic bullet and/or apple comes out with an update that will fix my problem.

I have the same problem with a Mac Pro connected to an Air Port Extreme, the new model using a manual IP address. The only solution is reboot my Mac. I noticed that my computer name keeps changing to (1), (2), and so on at the end of the computer name as it was a name conflict, every 2 or more weeks. Today I'm trying using another IP address and switch to the Ethernet port 2 if it has any effect. Will let you know.

Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.

Feedback

Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.

Feedback via Apple Developer

Not only do I have a virtually to non working Wifi connection. The ethernet connection (which I had to buy for my MacBook Pro Retina 2013) does drop connections as well. Thanks to Yosemite, it certainly makes a 'big impression', every bit as buggy as it looks, I would say.

I have solved the problem for my situation. This may or may not work for yours. I did the following: unchecked network access in the energy saver panel. This was creating various versions of Mac which I believe confused the computer when trying to connect. Then I shut down the Mac, unplugged the router and modem. Restarted everything. Plugged in modem, router and restart. This was two weeks ago and I have not had a problem. The current update seems to have speeded things along also. The only issue I have is that the log on page (Apple Website) is slow to load, but if I type an address into the address bar it goes quickly to the site.

HI all,

I too had this issue after updating to Yosemite. I followed the experience of barnashe above and it has sorted my problems (for the last five minutes so far) but better than anything else. Thanks barnashe.

can you give me step by step on how to delete internet settings please?