Q: Lion WiFi Connection Problem

Hi everyone, I have had similar problem with wifi on new macbook air 11 inch and using lion. What I have found works for me is to change your routers wpa2 to wpa security. Using anyones wpa2 it causes this drop out problem, so I have tested on all open, wep and wpa configurations and works perfect. So maybe all of you might want to try this. My router now is set to WPA TSK and works fine.

Add me to the growing list.  Just upgraded 13" mBP to Lion so I could use icloud and keep getting "internet not connected".  Rather confused by the growing list of potential solutions!

Just purchased an additional 3TB internal drive for my home MacPro so that I can install Snow Leopard and go through the painful process of manually installing everything over again.

Lion really has been a huge dissapointment for me. Maybe I will give it another chance when it reaches 10.7.5

I found the same as glenesp.  Resetting the  WPA TSK security on my router and resetting the WPA TSK password on my macbook and mac pro solved the problem I had and have had no recurrence over several weeks.  I have noticed that my mac pro is slow to make a connection though, if a time machine backup happens to be running.

As a summary of what I tried within the last days:

• Replacing Lion's wi-fi-driver for the Atheros-chipset with Snow Leopard's driver as described here http://rys.pixeltards.com/2011/09/04/osx-lion-wifi.html definitely worked in my case. No wi-fi-problems for about a week...
• Yesterday I went back to the Lion-driver (and the wi-fi-problems immediately came back) to give this http://www.nattl.at/2011/10/howto-disable-airdrop-on-osx-lion/ a try. It didn`t help...
• Then I tried setting IPv6 to "link local only" in the advanced network-settings... This made the problems disappear for some hours but now they`re back...

Gonna go back to Snow Leopard`s wi-fi-driver again and just hope for the wonder to happen with one of the next Lion-Updates...

This one DOES actually work. Late 2009 or iMacs ship with the Atheros chipset.  Installing the snowy driver made it all nice and fast again, finally!!!

Cyclic - could you explain in simple steps how you installed the SL driver? (I'm not at all tech savvy, so the explanation posted earlier on in this thread did not help me).

http://rys.pixeltards.com/2011/09/04/osx-lion-wifi.html

Sure!

Grab the file below, unzip it, unzip the zip inside it, drag the kext file beginning in "IO8" onto the app "Kext Utility", enter your password, reboot.

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"It’s trivial to downgrade to the v3.2 driver (shipped as a kernel extension or kext) using a kext utility developed for people bringing up OS X on non Apple hardware and the Snow Leopard kext harvested from an old Time Machine backup.

I’ve packaged both together and uploaded them to my Dropbox. Unzip, then unzip the Kext Utility, then drop the kext on the Utility app. Supply your password, reboot and then hopefully all is well with your Wi-Fi connection. Obviously only have a go if your Mac has Atheros Wi-Fi hardware!

v3.2 Atheros Wi-Fi driver from Snow Leopard, to use on Lion."

Like everything else about this problem, its wierd. This did not work for me but apparently works for some others

I still contend that this is all about how the driver, hardware and TCP/IP stack work together in the presence of interfering, weak or poor quality signals.  Please remember that WiFi is not the only application using the 2.4ghz spectrum.  It is allocated for FCC Part 15 devices in the US, and similar use in other parts of the world.  Wireless telephones, the X-10 wireless video link boxes, and many other devices also use this spectrum, so just looking at the list of "access points" is not going to "show" you what your WiFi hardware is dealing with.

So, if you haven't, please call Apple Care to make sure that your issue is documented.  If you don't, the "number of problems" won't be big enough to let them know that there is something going on which they need to deal with, pronto!  Try using "channel 11" as your 2.4ghz channel, or use "auto select" if that is available.  See if you can get find a slot somewhere in the spectrum that makes it better.  If you have a 5ghz "access point", name the 2.4ghz and 5.0ghz AP SSIDs different (if you can).  Select the 5ghz one and see if that makes a difference.

Try to create a focused effort on eliminating parts of the spectrum, or potentionally interferring equipment.  For example, if your AP is on one side of your dwelling, try moving it to the other side (I know that the WAN connection may not be available there, or you may have to have a giant segment of ethernet to move it).  This will let you eliminate a potentional "other device" that might be near where the AP is setting now.

Move your computer to the other side of the dwelling as well.  Some part of the software is likely not dealing with interference well, given the behavior everyone describes here.  But, because people are making it work, there has to be something that works around the problem, and you just need to figure out what is happening in your environment, and eliminate that cause.

I thought my wifi was better, but it started again and even worse after a week. I also placed the snow leopard drivers back and it looks like it has solved the problem. Hope this will last longer than one week and apple will find a fix. For now, my problem is solved! :-).

Cyclic,

I tried your SL driver downgrade, but no luck. I've noticed something during my troubleshooting escapades,that I thought I should share.

1. I can ping, but I can't browse (with any browser)
2. When I try to browse, there is actually some connectivity, but excrutiatingly slow.
3. During this ultra-slow browsing experience, I notice that there are bursts of DUP! errors in the PING stream.

Here is a screenshot of my Terminal executing PING:

Any ideas?

Version:1.0StartHTML:0000000167EndHTML:0000000900StartFragment:0000000484EndFrag ment:0000000884

Visit

http://www.pressbyte.com/6570/fix-wifi-connection-issue-mac-os-1072-lion/

and follow the instructions. It worked on both my MacBook Pro and my iMac. Good luck!

Yesterday I installed the SL driver. Today I can't connect to Internet anymore.

It just keeps saying ''Connection timed out''.

I think I am going back to Snow Leopard.

Any suggestion?

Cheers!

I talked to an apple tech yesterday. This is what he suggested:

Shutdown the computer, hold down shift + control + option then hit the power button (make sure you are plugged into power outlet).  The charger light should turn green then back to yellow, and the computer should remain off.  After this, try browsing. If this doesn't fix it, reboot while holding down command+R and reinstall Lion from recovery console.  I am about to reinstall now since nothing else has been a 100 percent solution, and eventually I am always back to square 1.