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Level 1

54 points

Mountain Lion disconnect from Ethernet in sleep mode

I have a late 2009 iMac running Mountain Lion. I use a program called LogMeIn to remotely access my iPhone from other computers and my iPhone. This app worked in Lion, since it was able to work even if my iMac was in sleep mode. However, in Mountain Lion, my iMac looses connection to both my Ethernet and Wi-Fi when it is in sleep mode, renedering LogMeIn useless. In order to use it, I had to sett sleep to never in the Energy Saver prefrences.

So basically, all networking stops on sleep, on both Ethernet and Wi-Fi. I did not encounter this problem in Lion, but ever since upgrading to Mountain Lion it's been happening. Does anyone have any suggestions to fix this? Is anyone else havin

iPhone 4S, iOS 5.1.1, Verizon, 16 GB, Black

Posted on Jul 30, 2012 4:07 AM

Best reply

Radiation Mac

Level 5

4,701 points

Posted on Jul 30, 2012 4:18 AM

If you have not, I would go to your "Applications" folder>System Preferences>Energy Saver> and check the box "Wake for Network Access".

Hope this helps 🙂

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234 replies

bsu1960

Level 1

0 points

Sep 23, 2012 1:59 AM in response to alfredo87

Howdy Alfredo87,

I really had high hopes 10.8.2 would be the magic fix for the loss of internet connectivity on my 2 Apple Computers.

Sadly the trouble persists.

All you can do is restart the computer as you use it and then just shutdown when your done.

I am really shocked, and too perturbed for kind words.

Apple is turning into Microsoft.

margate

Level 1

0 points

Sep 23, 2012 2:31 AM in response to bsu1960

Just wonder,

Do you all have "Configure : Automatically" on Network / Hardware Tab, other settings is

Speed: 1000baseT

Duplex: full-duplex, flow-control

MTU: Standard (1500)

I'm using DHCP and static DNS entries, my lease time is back to normal 7200, besides that I haven't seen the problem since I did SMC reset and the safe boot, running 10.8.2

I use LAN, not WIFI

Maybe disconnect 30 minutes or so, doing SMC reset, I unplugged before I left for work

bsu1960

Level 1

0 points

Sep 23, 2012 11:13 AM in response to margate

I am connected to the internet-- sporadically-- using wifi - with an Airport Extreme wireless device.

Sep 23, 2012 1:18 PM in response to bsu1960

hi bsu1960

it's happening already: this is update 10.8.X to come soon to our iMacs!!😝

only joking!!

kaleio

Level 1

5 points

Sep 23, 2012 2:05 PM in response to alfredo87

That was really funny! You had my hopes up there for a second. 😉

Sep 23, 2012 5:15 PM in response to sflomenb

All,

since my last post I have re-enabled the hard drive sleep. My setting is to let the hard drive sleep after 15 mins. So far so good....no issues. Have not had the ethernet disconnect and when waking, it connects in a timely manner. Hopefully this helps everyone and gets the attention of Apple.

So....to restate what I have done to get through this....manually set my dns severs to open dns and googles. Also, changed the search domains to be http://www.bing.com (I am sure if you set it to google or yahoo or whomever it will work).

Sep 23, 2012 5:22 PM in response to kevinwschafer

Sorry I didn't read every post in the forum.

Did you rename the system configuration folder and drag it to the desktop?

Sep 23, 2012 5:42 PM in response to boisebimmer

No...all I did was manually set my dns sever in my ethernet settings. Like this:

User uploaded file

That's it...simple. I fought with this for days....was getting real upset that the ethernet wasn't stable. Then I noticed my log in my router was getting hit with dhcp requests and was erroring....thought that was weird. I also stumbled upon an old forum dated sometime earlier this year with programmers writting code for something and thet were having problems with dns requests. Here is that link again for the forum: http://code.google.com/p/tunnelblick/issues/detail?id=206

Sep 23, 2012 9:06 PM in response to kevinwschafer

My setting is to let the hard drive sleep after 15 mins.

Where is the setting for hard drive sleep in minutes ??

BTW: I have 10.8.2 clean installed on a second hard drive to test.. Same issue

Sep 24, 2012 3:21 AM in response to lucas2999

I am sorry, that was an incorrect statement. It's the computer sleep at 15 mins. That setting is under "System Preferences"...then "Energy Saver". And for all of you wanting updates, again this morning when I "Woke" my iMac 21.5" mid-2011, the ethernet connection connected without any issues.

margate

Level 1

0 points

Sep 24, 2012 8:36 AM in response to sflomenb

Are u all on right EFI and SMC levels

http://support.apple.com/kb/HT1237

Model Name: iMac

Model Identifier: iMac12,2

Processor Name: Intel Core i7

Processor Speed: 3,4 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 8 MB

Memory: 16 GB

Boot ROM Version: IM121.0047.B1F

SMC Version (system): 1.72f2

Sep 24, 2012 8:58 AM in response to margate

Now i have 10.7.5 clean installed on my external hard drive - and all is fine..

SMC / PRAM reset / Safe mode / DNS and all the hints here have not helped..

I go back to Lion.. I need my system for work...shame

Sep 24, 2012 9:04 AM in response to margate

I bought the iMac about a month ago: EFI and all up to date.

This is a 'red herring'😕

The fact is that Apple does not care for their users and they will first to have to accept that this is a bug, then give it to some 'genius guru' to work on it and then, and only then, tell us that the update includes the' network connection sleep on iMacs' bug correction.

DISGUSTING BEHAVIOUR .... Apple, please, correct it soon, please!!