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

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Q: Internet connection lost after sleep - Ethernet

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  • by litterbuggy,

    litterbuggy litterbuggy Dec 20, 2009 4:36 PM in response to gthull644
    Level 1 (23 points)
    Apple TV
    Dec 20, 2009 4:36 PM in response to gthull644
    I'm having the same problem with my 20" iMac running Leopard (10.5.8), so the problem isn't limited to SL users. I generally restart my modem at least once to get the connection back. I just set 'Configure IPv6' to Off based on advice on a similar thread, so we'll see how that works. I'll post back if it does (and probably come back to whine if it doesn't).
  • by SLAPSHOTW,

    SLAPSHOTW SLAPSHOTW Dec 22, 2009 12:53 AM in response to gthull644
    Level 3 (745 points)
    Dec 22, 2009 12:53 AM in response to gthull644
    I'm having the same problem on a 27" i5 new iMac running 10.6.2.

    I get around it by going to network, turning Ethernet "off" (under the "configure IPv4 dropdown) and then turning it back on. It's annoying, but better than restarting and it works.
  • by Ted Peters,

    Ted Peters Ted Peters Dec 22, 2009 10:00 AM in response to SLAPSHOTW
    Level 1 (35 points)
    Dec 22, 2009 10:00 AM in response to SLAPSHOTW
    I've been working around this by disconnecting the Ethernet cable and reconnecting it.

    Faster and easier for me that wading into System Preferences.
  • by 8Adam8,

    8Adam8 8Adam8 Dec 22, 2009 11:30 AM in response to gthull644
    Level 1 (0 points)
    Dec 22, 2009 11:30 AM in response to gthull644
    Turning 'Configure IPv6' to Off in the advanced preferences seems to be helping. I have no idea what that does/accomplishes but it seems better!
  • by Erik Peterson,

    Erik Peterson Erik Peterson Dec 22, 2009 6:49 PM in response to Ted Peters
    Level 1 (35 points)
    Dec 22, 2009 6:49 PM in response to Ted Peters
    I'm having a similar problem with a 3 week old iMac 21.5". When it wakes from sleep it takes a while (maybe 30-60 seconds) to connect back to the network. My macbook pro on the smae network connects right away. Could the iMac have a bad airport card?
  • by Roy 27inch,

    Roy 27inch Roy 27inch Dec 23, 2009 3:01 AM in response to Erik Peterson
    Level 1 (10 points)
    Dec 23, 2009 3:01 AM in response to Erik Peterson
    Saying hi from the Netherlands. I also experiencing this problem on my brand new Imac 27inch i5. Tonight someone is coming and having a look if he can solve it, but i am afraid it's hardware.
    What I noticed so far is that it mostly occures when my notebook (also 802.11n) is on the network. As long as this device is turned off, no problem, imac always connects and is steady. My other book (802.11g) has no problems.

    I have tried with a digiconnect g router and an airport extreme, the round g edition, not 802.11n. I am working wireless.


    *Is there nobody who has had a proper answer from the helpdesk?!* I have called many times, but no proper answer. They where not able to check my connection because I didn't work with an airport extreme router at that moment! When it doesn't work out tonight, I will call in tomorrow, because I have the apple router now, and I am very curious what the solution will be! They will surely get my machine back if it's not solved this week, how is it possible that such an expensive machine works so badly?!?
  • by EC-ASP,

    EC-ASP EC-ASP Dec 26, 2009 5:26 AM in response to Roy 27inch
    Level 1 (0 points)
    Dec 26, 2009 5:26 AM in response to Roy 27inch
    Hi there from Spain,

    I'm having the same issue on my MBPro 15 inch, about 1 year old. I'm running off WiFi and the only solution that works for me so far is to reboot.

    This didn't happen before upgrading to 10.6.2 and maybe a few other updates. I remember an update which was about the airport card; unfortunately, I can't positively say that the problem began with that one. I can positively say that this didn't happen with Leopard, nor did it happen (or at least not enough to even register) with 10.6.0 and 10.6.1.

    What I do know is that repeatedly deactivating and reactivating the AP interface sometimes gets it to work for a bit, but not enough to be useable. In that state, pinging the router, for instance, will return some echoes after 30 seconds! I had never seen anything like that. The router is a relatively new Cisco which works perfectly well for the rest of the devices, so can't be blamed. The interface as seen by ifconfig en1 would sometimes show as inactive, sometimes active but without IP.

    A friend with a newer MBPro 15" complains about the same symptoms, on another network, and using cable. Therefore, it would seem that the issue is not tied to a specific network interface. Most odd.

    I'd really love to see this solved, I'm pretty sure it's Apple's fault (i.e., not the router, etc). In the meantime, a workaround that doesn't require a reboot (which is a PITA for me) would be great. So far I haven't been able to find one, though. Next I'll try to fiddle with the firewall and as suggested go to preferences and disable/enable several bits.
  • by 8Adam8,

    8Adam8 8Adam8 Dec 26, 2009 9:55 AM in response to gthull644
    Level 1 (0 points)
    Dec 26, 2009 9:55 AM in response to gthull644
    After further tweaking, turning on or off 'Configure IPv6' in the advanced preferences has no effect.
  • by litterbuggy,

    litterbuggy litterbuggy Dec 26, 2009 11:24 AM in response to gthull644
    Level 1 (23 points)
    Apple TV
    Dec 26, 2009 11:24 AM in response to gthull644
    I'm cautiously optimistic; I haven't lost the network after sleep ever since I turned off IPv6 configuration. Still crossing my fingers.

    On the other hand, I'm running 10.5.8 on an iMac manufactured in March. The new machines running Snow Leopard might have bugs, or might be incompatible somehow. I wonder if there's some mystery setting in SL that even the Apple genius bar hasn't scoped out yet.

    There are a lot of threads here (and on the iMac forum) about the same or similar problems; wander around and see if one of their suggestions work. I'm sure someone is going to figure this out pretty quick!
  • by Bob Grip,

    Bob Grip Bob Grip Dec 27, 2009 6:48 PM in response to gthull644
    Level 2 (185 points)
    Dec 27, 2009 6:48 PM in response to gthull644
    I'm having the same problem with my i5, which is connected by ethernet to my Airport Extreme. After a reboot, the connection is fine.
  • by Ted Peters,

    Ted Peters Ted Peters Dec 28, 2009 9:09 AM in response to Bob Grip
    Level 1 (35 points)
    Dec 28, 2009 9:09 AM in response to Bob Grip
    Try disconnecting and re-connecting the ethernet cable.

    Much faster than rebooting.
  • by BrandRealist,

    BrandRealist BrandRealist Dec 28, 2009 11:13 PM in response to gthull644
    Level 1 (0 points)
    Dec 28, 2009 11:13 PM in response to gthull644
    I've noticed this problem as well, I've had it twice now where I've woken the machine up from sleep mode after putting it to sleep the night before only to find out that I have no network connection despite the fact that the network settings under preferences shows I do. I found that a reboot resolves this problem but that's frustrating and annoying.

    Has anyone had a response from apple on this and whether its just a software update on a hardware issue?

    t does sound like the network controller isn't always waking up from sleep mode or something to that affect.
  • by Quentin Stafford-Fraser,

    Quentin Stafford-Fraser Quentin Stafford-Fraser Dec 29, 2009 8:12 AM in response to gthull644
    Level 1 (54 points)
    Dec 29, 2009 8:12 AM in response to gthull644
    I've been having this on my new 27" iMac. I think it may be something to do with routing because the ethernet adaptor still seems to know its IP address and still seems to re-acquire its DHCP address if asked to, but I can't ping the router.

    Going to the ethernet interface in the Network preferences and choosing 'Make Service Inactive' followed by 'Make Service Active' fixes it, but that's far from ideal.

    I've just made two changes which seem to help - haven't tested thoroughly yet or narrowed down which one made the difference, but I was thinking about what would happen during sleep and waking that didn't happen at other times.

    First, I went to the Advanced settings of the ethernet interface and under 'Ethernet' I turned off the auto-negotiation: ie. I set it to 'Configure manually' and whatever settings were in force when it was working normally (in my case 1000base T, full-duplex, flow-control and standard MTU - these will depend on your ethernet switch/router).

    Secondly, under the Energy Saver preferences, I turned off 'Wake for network access', in case that was putting the ethernet interface into a funny state.

    So far, this seems to have fixed it, but I haven't done the big test of the overnight sleep yet...
  • by MacDude123,

    MacDude123 MacDude123 Dec 29, 2009 1:27 PM in response to gthull644
    Level 1 (0 points)
    Dec 29, 2009 1:27 PM in response to gthull644
    Dont know if you solved this but I have a suggestion...

    I recently purchase and airport express to stream audio and share a printer.. During the installation of the AE i had to connect it directly to my Imac 24"Intel... I have a wireless router that my imac would automatically log on to.. After the installation of the AE it stopped doing this... After a quite a few different tries at playing with the network settings i did the following:
    Open system pref>>Network>>Click on your ethernet connection>> on this screen there is a small gear symbol with a down arrow>> click this and Click on Set Service Order>>Make sure Ethernet is first on this list (in my case since I have a wireless connection I clicked Airport)>>>It worked for me hope it works for you.
  • by Quentin Stafford-Fraser,

    Quentin Stafford-Fraser Quentin Stafford-Fraser Dec 31, 2009 2:04 AM in response to Quentin Stafford-Fraser
    Level 1 (54 points)
    Dec 31, 2009 2:04 AM in response to Quentin Stafford-Fraser
    OK, all - just to let you know that one or other of the two things I tried does seem to have fixed everything nicely for me. No problems since then.

    Message was edited by: Quentin Stafford-Fraser
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