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Mountain Lion disconnect from Ethernet in sleep mode

60611 Views 234 Replies Latest reply: Feb 10, 2014 1:39 PM by Wonderkid RSS
  • hexdiy Level 1 Level 1 (60 points)

    OK. Btw, I forgot to add the link in my last post. It is:,

    Post by derbothaus, who seems to know his way around Terminal pretty well.

    Good luck!

  • NeridaSydney Calculating status...
    Currently Being Moderated
    Jan 2, 2013 9:34 PM (in response to RRFS)

    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.

  • murrayE Level 1 Level 1 (40 points)

    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

  • hexdiy Level 1 Level 1 (60 points)
    Currently Being Moderated
    Jan 3, 2013 11:55 AM (in response to murrayE)

    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!

  • hexdiy Level 1 Level 1 (60 points)

    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?

  • margate Level 1 Level 1 (0 points)

    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


    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




    #Used by sleepwatcher to do stuff on wakeup

    #Called from /etc/rc.wakeup

    #Edit GW,  LIF and WIF as needed.


    #Gateway to test


    #LAN IP and Interface information


    #WIFI IP and Interface information



    #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"



    #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"


    #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 "" on the config files, remove with


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

    sudo xattr -d /etc/rc.wakeup

    sudo xattr -d /etc/rc.sleep


    Step 7:


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





    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

  • Taskil Calculating status...

    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.

  • audition74 Calculating status...
  • Allex2501 Level 1 Level 1 (0 points)

    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 Screen Shot 2013-02-02 at 8.18.21 PM.png

  • Ronaldo1965 Calculating status...


    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.

  • Ronaldo1965 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 2, 2013 10:34 PM (in response to margate)

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

  • Allex2501 Level 1 Level 1 (0 points)

    So did u try?

    Let me know what happen after u tried

  • BigBar Calculating status...

    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!

  • KID MAYHEM Calculating status...

    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.

  • BigBar Level 1 Level 1 (0 points)

    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.


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