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iMac OSX Lion loses internet connection (ethernet) waking up from sleep

My brand new iMac running Mac OS X 10.7.3 loses internet connection after computer wakes up from sleep. This is not a WiFi problem because I am plugged in with ethernet. It loses its connection roughly 50% of the time it wakes up and then I have to go through the diagnostics and reboot my cable modem and router. It is very frustrating. I have tried renewing the DHCP lease but the problem continues. Has anyone encountered this problem and what did you do to fix it? Thanks in advance.

iMac, Mac OS X (10.7.3)

Posted on Feb 22, 2012 6:09 PM

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46 replies

Feb 22, 2012 6:53 PM in response to vinnyob

I was literally just about to post the same issue. Brand new iMac on same OS. In just the last couple of days it stopped connecting after being put to sleep. My husband's computer in the next room works fine and I'm right next to the modem. The only way I can activiate the connection is to restart. The only changes to my computer were updates to Firefox and iTunes so that wouldn't change anything. BTW, I only put my computer to sleep manually. If I get an answer before you do, I'll post it.

Feb 22, 2012 6:57 PM in response to vinnyob

This appears to be a known issue, there are a couple of things both of you should do, first file a bug report in www.apple.com/feedback.


The next thing is more a work around than a fix. Instead of putting your computer to sleep just put the display to sleep. You will find this in System Preferences - Energy Saver. Set the computer sleep to Never and then set the display sleep to what ever time you prefer.

Feb 23, 2012 4:14 PM in response to vinnyob

Wait, does this mean that if I set up my computer to NEVER sleep. BUT let my display goto sleep, it won't stop my download? Cause I'm downloading a game right now. And it'll take like, 3-4 hours. I'd be asleep by then. But when I put my computer to sleep, it stops downloading. However if I set up my computer to never sleep but the display can go to sleep. Does that mean it won't stop the download? Please reply ASAP.

iMac OSX Lion loses internet connection (ethernet) waking up from sleep

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