Mountain Lion disconnect from Ethernet in sleep mode

I have found a solution that works for me: choose "Sleep" when I walk away from the computer, and the ethernet connection will come up normally when I wake the computer up.

Alternatively, if I forget to do this, and come back to a lost connection, I can choose "Sleep" and then wake the computer again, and all is well. Certainly better than restarting, and I'm a happier camper now.

NeridaSydney wrote:

I have found a solution that works for me: choose "Sleep" when I walk away from the computer, and the ethernet connection will come up normally when I wake the computer up....

In my experience, that does not always work! Over a period of months, the only solution I've found that works consistently on my hard-wired iMac is that, after I wake it up, execute the following commands in Terminal:

sudo ifconfig en0 down

sudo sleep 10

sudo ifconfig en0 up

For users experiencing the same problems over WiFi, it might be interesting to substitute "en0" by "en1":

sudo ifconfig en1 down

sudo sleep 10

sudo ifconfig en1 up

Thank you, murrayE!

And, BTW, coulnd't somebody make a daemon out of both Terminal command sets ( en0 + en1) that reacts at wakeup? I myself am not experienced enough, but surely somebody out here is?

Only a few times I lost my network since August where I did the SMC resets etc.

Anyway, Thanks to Bernhard de Baehr it is fairly easy to make a function to Down/Up interfaces using sleepwatcher 2.2 which you can download from http://www.bernhard-baehr.de/

I choosed system wide, so my commands are for system wide

1. Download SleepWatcher_2.2 to Desktop

2. Dbl. click to unzip, a SleepWatcher 2.2 folder is created in desktop

3. Open ReadMe.rtf and follow "Installation for new SleepWatcher users" using Terminal Window

Comments on steps in ReadMe.rtf:

Step 3:

With vi or your favorite editor create .sleep and .wakeup scripts with actions in your home folder /Users/<username>

For this problem I only use .wakeup with the follwing content, omit ---------------------------------- lines

----------------------------------

#!/bin/sh

#Used by sleepwatcher to do stuff on wakeup

#Called from /etc/rc.wakeup

#Edit GW, LIF and WIF as needed.

#Gateway to test

GW=192.168.1.1

#LAN IP and Interface information

LIF=en0

#WIFI IP and Interface information

#WIF=en1

#Down and Up LAN interface if GW is unavailable through $LIF

if [ "$LIF" != "" ] && [ $(ping -b $LIF -t 1 -c 4 $GW 2>&1|grep -c "100.0% packet loss") != 0 ]; then

ifconfig $LIF down

sleep 1

ifconfig $LIF up

logger "wakeup: $LIF re-cycled"

fi

#Down and Up WIFI interface if GW is unavailable through $WIF

if [ "$WIF" != "" ] && [ $(ping -b $WIF -t 1 -c 4 $GW 2>&1|grep -c "100.0% packet

loss") != 0 ]; then

ifconfig $WIF down

sleep 1

ifconfig $WIF up

logger "wakeup: $WIF re-cycled"

fi

#Other stuff to follow

-----------------------------------

Change permission

chmod 750 .sleep

chmod 750 .wakeup

Step 5: I skipped this because file copied in Step 6 and permanent load is done with -w in Step 7

Step 6:

sudo cp Desktop/sleepwatcher_2.2/config/de.bernhard-baehr.sleepwatcher-20compatibility. plist /Library/LaunchDaemons/

chmod 644 /Library/LaunchDaemons/de.bernhard-baehr.sleepwatcher-20compatibility.plist

sudo cp Desktop/sleepwatcher_2.2/config/rc.* /etc

sudo chmod 750 /etc/rc.sleep

sudo chmod 750 /etc/rc.wakeup

There is a extented attribute "com.apple.quarantine" on the config files, remove with

sudo xattr -d com.apple.quarantine /Library/LaunchDaemons/de.bernhard-baehr.sleepwatcher-20compatibility.plist

sudo xattr -d com.apple.quarantine /etc/rc.wakeup

sudo xattr -d com.apple.quarantine /etc/rc.sleep

Step 7:

sudo launchctl load -w /Library/LaunchDaemons/de.bernhard-baehr.sleepwatcher-20compatibility.plist

4.Test

reboot

from Terminal do

sudo launchctl list | grep sleepwatcher and check that "de.bernhard-baehr.sleepwatcher" is running

tail -f /var/log/system.log | grep wakeup

sleep/wake a few times and watch for wakeup entries in system.log

if ping succeeds in .wakeup there are no wakeup entries

All set 🙂

I have same email problem but only using an iMac with with wifi on a Sky modem/router. I have tried it with other modem/routers like BT and it works fine. Sometimes restarting mail works, sometimes resetting the modem and sometimes restarting the iMac but it definitely seems to be only with the Sky router. Not tried a wired ethernet connection as presumed it was an incompatability between router and iMac.

Hi everyone, hope this could help if it's not been covered in previous posts. 🙂

http://reviews.cnet.com/8301-13727_7-57565272-263/caffeinate-mountain-lion-to-pr event-it-from-sleeping/?part=rss&subj=news&tag=title

FIxed my problem!

After years the problem was solved somply!

Go to System preferences

Go to Ethernet
Go to Advance
Go to Hardware

The just make the changes like in the pictures below

it work for me

Hi,

Sorry to say it does not help. Actually it was even more difficult to come out the disconnected state.

Officially you can only do this if you are are able to set your switchport to 1000Fdx instead of autonegotiate. And then it even might work. Because the problem looks like a negotitiation problem. But most switches can't be managed. So then it won't fix anything.

This looks very good. I am going to try this too.

So did u try?

Let me know what happen after u tried

My Mountain Lion Mail also refuses to connect to accounts after waking from sleep. I have to quit and restart Mail to get the accounts to reconnect. One interesting twist to this is that one time I let the machine go to sleep while Windows 7 on Parallels had an open window. In this case, Mail did not lose connection to the accounts. This might be a clue. VERY frustrating!

My work around is keeping a shortcut to Network Diagnostics on my Dock Menu. To do this, follow the instruction Here. Running this Utility gets my Wifi connection back after resuming from Sleep Mode.

My problem was that the Mail accounts would disconnect during Sleep. I had to quit and researt Mail to get my mail flowing again. After I upgraded to OS10.8.2, about a week ago, the problem went away and hasn't returned. 🙂

Mac Mini 2010.

BigBar, if this means Apple has included a fix for this enduring sleep problem, this means an end to this difficult and long spun thread. And they all lived happily ever after...

Thanks! Otherwise: growl (meant to be ambiguous by all means). Please notify is the more polite term. But not the software...