gthull644

Q: Internet connection lost after sleep - Ethernet

I have just started using a new router (a Linksys). My problem is that after the iMac comes out of sleep I cannot get an internet connection using ethernet. It is not the router, a PC connected at the same time does not lose its connection and the internet light on the router stays lit.

When I lose the connection I cannot access the router's web page @ 192.168.1.1. The admin login box appears but with a name that relates to a previous router I used. I assume that this is part of the problem.

Any ideas?

iMac, Mac OS X (10.6.2)

Posted on Dec 8, 2009 9:01 AM

Close

Q: Internet connection lost after sleep - Ethernet

  • All replies
  • Helpful answers

first Previous Page 25 of 27 last Next
  • by curtisinoc,

    curtisinoc curtisinoc Nov 25, 2012 7:24 PM in response to Ric91
    Level 1 (0 points)
    Nov 25, 2012 7:24 PM in response to Ric91

    Ric91,

     

    Where on my mac (mountain lion 10.8.2) do I find the setting to do this?:

    "disable the ethernet adapter in system settings and enable it again will work every time"

     

    Thanks

  • by Ric91,

    Ric91 Ric91 Nov 25, 2012 10:46 PM in response to curtisinoc
    Level 1 (0 points)
    Nov 25, 2012 10:46 PM in response to curtisinoc

    Curtis:

    - choose Apple menu > System Preferences

    - select Network preferences

    - select your ethernet connection on the left ("Ethernet")

    - now use the small gear-wheel at the bottom of the panel to deactivate this service

    - click the Apply-Button on the right

    - now use the gear-wheel again to activate this service

    - click Apply once more

     

    Regards Ric

  • by Stephen Dawson1,

    Stephen Dawson1 Stephen Dawson1 Nov 26, 2012 2:55 AM in response to speedandfinality
    Level 1 (13 points)
    Mac OS X
    Nov 26, 2012 2:55 AM in response to speedandfinality

    Hi speedandfinality. I think you're suffering a problem that has raised its head since Snow Leopard days. Basically, DNS stops working. Specifically, the mDNSresponder process stops working. Firefox doesn't seem to use this layer in MAC OSX, Safari and Chrome do. Killing mDNSresponder results in it restarting and normal network operation resumes (or you can sometimes just wait a while and it starts working by itself).

     

    I dug around and found http://kyen99.tumblr.com, which mentions this problem for Snow Leopard, and provides a program you can download that kills the process if you don't like delving into Terminal. You can put this in your dock for quick access.

     

    Actually, for me, I always got this problem when a firewire scanner was connected during sleep. Disconnecting it solved the problem. But there are many, many people with different symptoms.

     

    Hope this helps.

  • by curtisinoc,

    curtisinoc curtisinoc Nov 26, 2012 5:15 AM in response to Ric91
    Level 1 (0 points)
    Nov 26, 2012 5:15 AM in response to Ric91

    Thank you Ric !!

    I was getting annoyed by having to "restart" my iMac every so often when I encountered this problem.  I will use this method next time.

  • by speedandfinality,

    speedandfinality speedandfinality Nov 26, 2012 6:49 PM in response to Stephen Dawson1
    Level 1 (4 points)
    Nov 26, 2012 6:49 PM in response to Stephen Dawson1

    Thanks for your help.  I tried the ethernet deactivation/activation sequence suggested by Ric91, but that didn't work either.  I don't mind trying the program you suggested or even fooling with the Terminal, but since Firefox works, I will stick with it for now.  It's hard to believe that this has been going on since Snow Leopard and Apple hasn't fixed it.

  • by Stephen Dawson1,

    Stephen Dawson1 Stephen Dawson1 Nov 26, 2012 7:16 PM in response to speedandfinality
    Level 1 (13 points)
    Mac OS X
    Nov 26, 2012 7:16 PM in response to speedandfinality

    You'll find that most other programs won't be able to access the Internet either. But if web browsing is all that you're doing during the "outage", stick with Firefox by all means.

  • by Ronald Hasler,

    Ronald Hasler Ronald Hasler Nov 26, 2012 10:10 PM in response to Bim101
    Level 1 (0 points)
    Nov 26, 2012 10:10 PM in response to Bim101

    I had pretty much the exact situation with my new iMac. Intermittent Ethernet disconnection after sleep, followed soon after with total disconnection. Nothing I tried worked. At first, restarting it while it was in the intermittent stage seemed to work but that sure was a tiring scenario. I was almost glad when it stopped working altogether. I have Apple Care so I eventually called and, after determining my modem and cable hardware were not at fault, they recommended a visit to the Genius Bar. GB took no time in assessing the problem and quickly pulled the computer in for a new logic board. I get it back I a couple of days, hallelujah!

  • by Ric91,

    Ric91 Ric91 Nov 26, 2012 10:48 PM in response to speedandfinality
    Level 1 (0 points)
    Nov 26, 2012 10:48 PM in response to speedandfinality

    Your problem ist complete different than the one described here. If Firefox works you do not have lost internet connetion. So it is pretty normal that this solution will not fix any other problems.

  • by curtisinoc,

    curtisinoc curtisinoc Nov 27, 2012 5:10 AM in response to Ric91
    Level 1 (0 points)
    Nov 27, 2012 5:10 AM in response to Ric91

    This thread started in 2009 and its obvious that this is a REAL problem/issue for many people . . .  Apple has to be listening and aware . . . right???  sheesh!

  • by danielfinegan,

    danielfinegan danielfinegan Nov 28, 2012 7:06 AM in response to curtisinoc
    Level 1 (0 points)
    Nov 28, 2012 7:06 AM in response to curtisinoc

    I was having the same problem - very delayed connection to the internet after waking up from sleep - on my brand new iMac. In my case, disabling the firewall (system preferences-security and privacy-firewall)

    solved the problem.

     

    A firewall is provided by my FIOS provider, so I have no concerns with shutting off the OS X firewall.

     

    Regards -

     

    Dan

  • by curtisinoc,

    curtisinoc curtisinoc Dec 2, 2012 5:28 PM in response to Ric91
    Level 1 (0 points)
    Dec 2, 2012 5:28 PM in response to Ric91

    Thanks again Ric . .  problem occured tonight for the first time in a while.  Just tried your suggestion which worked like a charm.  Sure beats restarting my Mac.

  • by KJezza,

    KJezza KJezza Feb 22, 2013 3:01 AM in response to curtisinoc
    Level 1 (0 points)
    Feb 22, 2013 3:01 AM in response to curtisinoc

    I found this problem resolved by switching Airport off and on again. Is my Airport card dodgy?

  • by Stokestack,

    Stokestack Stokestack Apr 15, 2013 12:06 AM in response to KJezza
    Level 1 (9 points)
    Mac OS X
    Apr 15, 2013 12:06 AM in response to KJezza

    I suddenly started getting this under 10.8.3, but it's not application-specific.  On waking, the OS will present a dialog saying none of my known networks is available.  But of course it is, and I have to reconnect to it.  Every time.

  • by Ric91,

    Ric91 Ric91 Apr 15, 2013 12:13 AM in response to Stokestack
    Level 1 (0 points)
    Apr 15, 2013 12:13 AM in response to Stokestack

    If I understand your post you connect your network by Airport. This thread is about Ethernet-connections so I'm afraid you won't find answers here.

    Try to delete all of your known networks and reconnect to your network by entering your WiFi password.

  • by Ric91,

    Ric91 Ric91 Apr 15, 2013 12:23 AM in response to gthull644
    Level 1 (0 points)
    Apr 15, 2013 12:23 AM in response to gthull644

    Finally I got it working. I visited our local Apple Store several times as my iMac was still in warranty. First they have done a "software reset", whatever this means. I got my iMac back at the Genius Bar completely wiped out and with a new OS X installation - good to have several backups.

    After that my iMac runs well a few days, then all came back to me. One day I had broken ethernet connections nearly on every wakeup.

    I put my iMac back to the Genius Bar. This time they gave me a new logic board. This happened three weeks ago and I had no more problems.

    So it looks like a faulty logic board to me, which some other iMac users confirmed before.

first Previous Page 25 of 27 last Next