iMAC 21" WIFI failing after 10.7.4 update

How many Preferred networks do you guys have in your Preferred Network Lists ? Try keeping it under 5. That seemed to resolve the issue for me.

Exact same problem here - can't reproduce it reliably, though. One minute everything is OK, then suddenly my iMac (21,5", i5) can't find _any_ Wi-Fi networks, even though my apartment building is full of them, our two iPhones and two MacBooks (Pro and Air) keep on working. Only started after the 10.7.4. update. Really frustrating.

Mine seems to have resolved by deleting all known networks, adding and then deleting a new location. Then taking the tick out of the box remember know networks. So far so good, but Apple, Realy? You need to patch this ASAP.

I am getting the impression it is also isolated to Airport Extreme/Time Capsule Routers.

Hello, today again - after waking up from sleep, wifi was gone. My log file is full of these errors:

17.05.12 20:56:09,000 kernel: 78615.025653: ath_reset: unable to reset hardware; hal status 17

17.05.12 20:56:11,000 kernel: 78616.313488: ath_chan_set: unable to reset channel 140 (5700Mhz) flags 0x10100 hal status 17

17.05.12 20:56:12,000 kernel: 78617.737277: ath_chan_set: unable to reset channel 100 (5500Mhz) flags 0x20100 hal status 17

17.05.12 20:56:14,000 kernel: 78619.771524: ath_reset: unable to reset hardware; hal status 17

17.05.12 20:56:16,000 kernel: 78621.272592: ath_chan_set: unable to reset channel 1 (2412Mhz) flags 0x10080 hal status 17

17.05.12 20:56:17,000 kernel: 78622.655291: ath_chan_set: unable to reset channel 6 (2437Mhz) flags 0x10080 hal status 17

and much more of these...

17.05.12 20:56:32,000 kernel: KAUTH: unable to get path for vp 0xffffff803b7e4170 (err=22)

17.05.12 20:56:32,000 kernel: EV: OnAccess module for MAC OS X: 'Get path from vnode failed' at line: 3383 dt:000005912[ns]

17.05.12 20:56:32,000 kernel: KAUTH: unable to get path for vp 0xffffff803b7e3e88 (err=22)

17.05.12 20:56:32,000 kernel: EV: OnAccess module for MAC OS X: 'Get path from vnode failed' at line: 3383 dt:000002010[ns]

Only full restart helped. I have saved logs just after wake up and immediately after reboot so if anybody want to analyze it, just e-mail me.

I have 2 and still have this problem.

http://support.apple.com/kb/DL1524

I have the same thing. I use the imac 27" to share internet to macbook and ipad. The macbook and ipad can join the network, and the internet works for about 5 seconds, then never again.

Hi!I have the same issue with iMac 21'.After update to 10.7.4 everything was just fine,after turn off/on my iMac said WPA2 key is incorrect.i've tried to delete a connection ,but still no results.turning off and on of the router solved the problem(will inform if works fine later).

Pls,open bugreport at bugreport.apple.com

Hi same problem as all

Updated 2011 iMac 27" to 10.7.4 (using Airport Extreme wifi) and it drops the wifi somewhere between once every few hours and once every 20 or 30 minutes. The iMac cannot see any wifi networks when this happens. As with others Airbook, iPad, and iPhone all still see the wifi network. Only solution is to restart the Mac.

This *****. Apple please provide fix.

As "wifiguru" and other threads mention, installing the 10.7.4 combo update might solve the problem, but...

Don't bother! Just did it, and the issue remains.

I have now connected my iMac using a long cable running from one end of the house to the other. This goes very nice with the beatiful and expensive look of the iMac :-/

Regards

One sad and mad Apple user!

I had the same problems as everyone else, but it has been 2 days now and since disabling Bluetooth I haven't had any issues. I really wish I could have my bluetooth mouse back but having wifi is more important.

Good to know but doesn't really help - I really don't want to (or feel I should be made to) buy a new keyboard and mouse!

Please there must be another fix!

Does Apple monitor these boards?

There are "only" 29 posts so it is under a resolution of Apple guys. But you can try a direct feedback: http://www.apple.com/feedback/macosx.html

I sent one a week ago and absolutely no response.