Q: Updated to 10.7.3. Wifi drops constantly.

I installed the update last night and now it is connecting automatically after sleep mode but it drops the connection every few minutes. ARG!

Airport connection hasd similar bugs prior to 10.7.2, somewhat corrected in 10.7.1 as compared to 10.7.0, but all seem OK in 10.7.3. I wonder why it is worse there.

Are there apps starting up at login? Can you uncheck their automatic start-up?

Or, simply create a new user, log out and log in into new user. do you experience the same problem? or just in the current account?

I have updated my iMac, late 2011, to the recent 10.7.3 via Software Update. Everything went well for a week or so, until yesterday, when my Wi-Fi connection kept saying Alert: No internet connection. Everything was going well on my iPhone.

Sometimes a turn off and on of the airport interface would do it, sometimes a diagnostic would do it, and sometimes a reboot of the router did the trick. I have set a static ip and the google public dns address in my wi-fi connection settings and it works flawlessly now. However, if I put it DHCP again, the connection breaks after getting out from sleep, and neither my iMac nor my iPhone can get an IP.

I don't know who's broken now. The iMac, even if it worked good for a week, or my router. Or there is some kind of a handshake problem and my router goes mad after it can't solve the problems with the iMac.

I have over-installed the Combo update, but it did not solve anything.

If anyone has an ideea, I would appreciate it.

Yesterday the Apple Support told me

Many tests, reconfiguration wifi, erase configuration files, etc

Just reinstall did fix the problem

Now I'm on 10.7.2

I do not update it until next update 10.7.4 or fix it in next patch update

Un saludo a todos

This is an issue with the 10.7.3 update.  There are a ton of threads about the issue, with most people not having had any problems prior to the 10.7.3 update, and with many different types of routers.  Speaking for myself I have had no change in my local environment equipment/people or otherwise, other than installing the 10.7.3 update.  immediately after that my imac developed the no network problem after sleep.  Well there was an update for my Apple Extreme router recently also, but people are complaining of the same symptoms with other brand of routers also.

I just applied the EFI update to my imac and at least this one time it did connect to wifi after waking from sleep.  Not sure if it was a fluke or not but it has worked at least once now.

Same problem with my mid 2010 iMac. Wi Fi would not automatically reconnect to my network after sleep mode. Haven't had this problem with 10.7.1 nor with 10.7.2

The thing is that even for a week after the update, for me, it still worked. And I'm guessing that the misunderstandings between the iMac and the router makes it for other devices to be unable to connect to the router until a restart. I was even thinking of flashing dd-wrt to my router, because I just don't understand what has changed after a week of everything going fine.

Just bought a 21" iMac and updated to 10.7.3 and have the not connecting after sleep issue. This is my first Mac as I heard that they "just worked". I am not impressed.

ok so I was wrong the EFI did not fix it.  It worked once but now it is back to not working when it wakes from sleep again

I was having the same problem with my mid-2011 iMac.  I tried everything: delete all the network settings, reinstall the combo update, reinstall Lion from a fresh 10.7.3 DVD, and nothing helped.  Then I tried resetting the SMC and zapping the PRAM and I haven't had trouble since.  Not sure which one of those fixed it, or if it was a combo of things, but it's reconnected every time since then.

Did anyone try to reinstall mac os x lion from the recovery partition? From what I understand, it will download a copy from the internet, and install a fresh 10.7.3, while keeping all your files, folders, settings and whatnot. Most people say they had great success with this, from what I've read.

Heyy Jeff,

I have tried yout method and it is the only thing that solved my problem. So I too recommend resetting SMC and zapping PRAM. Everything is working ok on my macbook.

reset the pram and smc on my imac made no differance, still doesn't connect after waking from sleep for me

There definately is a bug in the WiFi-implementation in OSX 10.7.3.

My Mac mini with Atheros 9280 AirPort-card that was working without any problems in OSX 10.7.2 and even had the AirDrop-option, gave a "WiFi: no hardware installed" error after upgrading to 10.7.3...

I've spent a lot of time trying to get things right and did try all options supplied everywhere (repairing permissions, zapping PRAM, replacing the .kext from TimeMachine, manually reinstalling the 10.7.3 Combo update, etc. etc.)

nothing helped... or other options (like reinstalling OSX or downgrading & upgrading OSX) seemed to work properly on first installment, but got me back into the same error after the first restart of my Mac (and after every restart ever since) 

...until I noticed that one thing was really odd : when starting up in 'Rescue Mode' (pressing Apple(CMD)+R during startup) I noticed that then my WiFi was 'magically ressurected' ; the AirPort-card was recognised and automatically reconnected to my AirPort/WiFi-network...

I've found only one way to fix this :

1- download the Kext Utility here : http://cvad-mac.narod2.ru/Kext_Utility

2- then… reinstall the IO8211Family.kext from 10.6 Snow Leopard and reboot (get it from a 10.6 install DVD)

3- and only after that... you will be able to successfully reinstall the IO8211Family.kext from 10.7.2 (get it from your TimeMachine backup) [this last step is only needed if you want the AirDrop-option back]

The odd thing is that the IO8211Family.kext from 10.7.2 seems to be exactly the same as the one from 10.7.3 since they have exactly the same version number (4.1.2) and creation and modification dates...

...and directly installing the IO8211Family.kext from 10.7.2 onto 10.7.3 doesn't work either...

The only difference I've noticed is that the firmware is now “Atheros 9280: 4.0.61.4-P2P” under OSX 10.7.3

but it used to be “Atehros 9280: 4.0.58.4-P2P” under OSX 10.7.2...

That could be the source of this problem…

Could it be that the 10.7.3-installer updated the Atheros 9280′s firmware, but that 10.7.3 itself isn’t compatible with the new firmware ???

Please Apple - get this fixed a.s.a.p. - it's not acceptable that there is a "WiFi: no hardware installed" error on Mac with a fully functioning original AirPort-card...