Under Yosemite iMac will not stay connected to ethernet network

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Under Yosemite iMac will not stay connected to ethernet network

Mac OS X 10.10.1

When attached to Netgear Prosafe gigabit unmanaged switch (circa 2007) iMac Retina, Mac Pro, Macbook Pro will not stay connected to Apple Airport managed ethernet LAN. With Sys Prefs Network panel open I can watch the ethernet connect and disconnect on a periodic basis (about every 15 secs!). When same machines are connected to ethernet ports on the Airport itself, connections are steady and permanent. I suspect incompatibility with networking protocol used by Netgear but assuming their protocol is standard the incompatibility must be in Yosemite. Did NOT have this problem under Mavericks with any of my machines.

Is my only alternative to order a new gigabit switch? If so, have protocols changed in the intervening 6 years such that Yosemite is not compatible with older switches?

Six +, Mac OS X (10.6.4), MBPs, Mac Pro, iMacs

Posted on Nov 22, 2014 5:52 AM

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Answer 1

Nov 22, 2014 7:13 PM in response to Doc Swift

Same issue here with a late 09 iMac. Had downgrade to manual at 100baseT solved the ethernet connection issue. It appears that Yosemite broke gigabyte capability.

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Answer 2

Doc Swift Author

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Nov 23, 2014 7:15 PM in response to pisacksen

Thanks for the insight but my case is different. I can connect at gigabit speed to my apple airport ethernet ports with 100% reliability. I cannot connect to my gigabit Netgear switches with any of my computers running 10.10.1 (which of course is connected to my airport router).

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Answer 3

Nov 23, 2014 7:21 PM in response to Doc Swift

Similar situation none the less. My iMac (late 09) cannot connect gigabit to an external linksys switch. It can connect 100baseT.

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Answer 4

Doc Swift Author

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Nov 23, 2014 7:25 PM in response to pisacksen

Oh- understood. I have gone to wireless with most of my tech and made do with the 3 ports on my airport. Also have ordered a newer model of netgear switch to see if the hardware has changed. Will comment on success or lack thereof when it is online in a few days. It would certainly be sad if we have to downgrade to megabit speed to run wired with 10.10.1!

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Answer 5

Doc Swift Author

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Nov 26, 2014 7:56 AM in response to pisacksen

Well, my 6 year old netgear gigabit switch must have been partially failing because when I replaced it with the current model (same specs, same model name, but sold as an updated model??) things are now going fine. Getting gigabit network speeds on all computers and 100% reliable connection. Guess it was just a coincidence that my Yosemite update and the switch failure occurred at the same time.

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Answer 6

Nov 27, 2014 10:19 AM in response to Doc Swift

Put in a new Netgear switch and success.

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