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Wifi Constantly Dropping in Lion

Since upgrading my Fall 2009 21.5" iMac to Lion my wifi connection will drop out about every minute and the I have to turn Wifi off and then back on to get it to connect again. Is there any known way to fix this? Any suggestions will be appreciated


Thanks

iMac, Mac OS X (10.7)

Posted on Jul 20, 2011 1:26 PM

Reply
2,259 replies

Mar 2, 2012 8:59 AM in response to oliviazsun

Hi All,


Juts installed the wifi patch and still having it drop out.


oliviazsun the workflow you outlined didn't work when the Apple tech walked me through it, and still doesn't. This is getting very frustrating so another call to Apple to see whats the next stage... perhaps I should have brought an MacBok instead of this pain.... had an 11 year old iBook the only issue was I couldn't update the OS so went the iMac route I'd beenbetter off keeping the iBook... apologies ******** juts had enough now want to throw the iMac through a window just like you would a MS OS PC thing...

Mar 2, 2012 11:34 AM in response to WSR

WSR wrote:


..... try not to read the ridiculous comments that follow it though as they don't help anybody.


Lol says the kettle.


@Baron

There have been a lot of proposed solutions to this problem, some of which seemed to have helped some people, while others (like me) are still stuck dealing with drop outs.


If you jump back to page 73 in this forum (https://discussions.apple.com/thread/3190651?start=1050&tstart=0) you'll see a post by me that links to a couple dozen possible fixes I've personally tried. Maybe one of them will work for you.

Mar 2, 2012 4:00 PM in response to lhale

Hey everyone,


I followed oliviazsun's workaround and it seems to have fixed the network dropping problem for me. It's been 2 days now and my computer has yet to drop the network, but I still have my fingers crossed. Before I did the suggested workaround my iMac was dropping my home network approximately hourly, which was a big pain in the behind as I often need to remotely access my computer from school. Upon restart my computer now automatically joins the home network without issue. My sympathies for all those who cannot get this to work. I understand how frustrating that can be. To reiterate, here is oliviazsun's workaround:



"1. Renew DHCP Lease


System Pref -> Network -> Select Wi-Fi -> Advanced -> TCP/IP tab -> Click Renew DHCP Lease

http://osxdaily.com/2011/11/06/lion-wi-fi-problems-solution-mac/ - found a supporting article for this


2. Removing all preferred networks:


a) Back to Advanced screen, Wi-fi tab, remove all entries in "Preferred Networks" window -> OK and then Apply

b) go to KeyChain, remove your wi-fi network's password entry.

c) reapply the wi-fi fix and re-start, re-join my wi-fi network."



I hate to add my own 2 cents to the above bickering, but I believe such banter really detracts from the usefullness of this support forum. This is a user-to-user forum, and this particular thread is evidently already difficult to navigate. We are all in the same boat, and this is not the place for passing judgement on Apple Support. Instead, if you would like to submit feedback on your Support experiences, wether they be good or bad, I suggest checking this out instead: http://www.apple.com/support/feedback/


Thanks, and good luck everyone!

Mar 2, 2012 6:55 PM in response to lhale

unexpected workaround for me: leave Activity Monitor / Network running


like many here I had wifi dropping randomly, especially, but not exclusively, after sleep... of course iphone, ipad, other macs have no problem


i tried many solutions/workarounds: new leases, killing preferred, beacon shortening, power button wake, 1.0 "fix" etc.


nothing worked and i had given up and resigned to waiting for Mountain Lion when I happened to leave Activity Monitor running overnight... wifi stayed connected and has ever since (48 hours)... i'm afraid to quit it....


hope this helps somebody else


imac 27" mid-2010

OSX 10.7.3

medialink WAPR-150N

Mar 3, 2012 7:34 AM in response to Gregg Foster

My MacPro, which is Ethernet hardwired to my Linksys router, drops the Internet connection just as often as my MacBook does. For the MacBook, I only need to turn off the WiFi and turn it back on and I'm good to go for about another 24 hours.


For my MacPro, however, a computer restart has been the only way to re-acquire Internet (WAN) access.


It is worth noting that I do not ever lose connection to the router. The LAN is always up; each Mac can see all devices on my LAN (about 10 of them). Both Macs can access the admin page on the router easily. Only the WAN is shut down.

Mar 3, 2012 7:50 AM in response to lhale

I do not have Apple Care, but somehow, through some service evaluation forms I have filled out, I have been assiged a case number by Apple Engineering.


They have sent to me a WiFi Data Logger untilty to capture all events from which they can analyze why the links are dropping. The only problem is the resulting text file can grow quite large.

So Apple has asked me to make a note of the time when I lose connectivity. But I may be away from the computers for several hours during which the drop-out will have occured.


So ... question: does anyone know of an App that can provide a continuous PING (say every minute or so) to an IP and create a log file that contains a TIME STAMP?

Mar 3, 2012 1:33 PM in response to Carlo TD

Carlo TD wrote:


I just read an interesting article. http://compnetworking.about.com/b/2012/02/18/what-the-fbi-internet-dns-shutdown- means-to-you.htm

Everyone having problems with their network dropping out should check their DNS servers to see if they match any of the ones that this article points at:


http://www.fbi.gov/news/stories/2011/november/malware_110911/DNS-changer-malware .pdf


That could be one reason why you network misbehaves. If you have a different problem source, such as this "DNSChanger" malware, it can feel like you have a problem related to Lion, when in fact the appearance of the problem may have just happened in Lion due to other timing.

Mar 3, 2012 2:05 PM in response to gphonei

Thanks for the heads-up ... the articles make for interesting reading. But I don't believe the Rogue DNS applies in my case. I have multiple WiFi devices dependent upon a connection to the two DNSs of my ISP (2 IP cameras, a Roku Box, Apple TV, a Blue Ray Player). I also have two Windows machines (WiFi connected laptop and a hardwired desktop), 2 iPhones, one iPad, one MacBook (WiFi) and one MacPro (Hardwired Ethernet to the router).


Everything on my LAN works just fine ... except for the two Macs running Lion.

Mar 3, 2012 2:05 PM in response to Big Red Dog

So ... question: does anyone know of an App that can provide a continuous PING (say every minute or so) to an IP and create a log file that contains a TIME STAMP?

In a terminal window, you can just run this script which should tell you about when things come and go. If you pass it a particular address, it will ping that. You could start out, pinging your router to see if that ever goes away, and then move to some external address if not.


#!/bin/sh


failed=/tmp/$$failed

sleep=30


trap "rm -f /tmp/$$*;exit" 0 1 2 3 15

echo "Starting ping to ${1:-www.google.com} at: `date`"


while :

do

if ping -c1 -t 3 ${1:-www.google.com} >/dev/null 2>&1; then

if [ -f $failed ]; then

echo "Resumed ping to ${1:-www.google.com} at: `date`"

sleep=30

rm -f $failed

fi

else

if [ ! -f $failed ]; then

sleep=5

echo "Can't ping ${1:-www.google.com} at: `date`"

fi

fi

sleep $sleep

done

Wifi Constantly Dropping in Lion

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