Wifi problem since 10.11.2

same here. no problems with my home network but in the office i get no ip address.

Same here... Problem occurs just after installing the 10.11.2

Before this new version, everything was ok.

Same here, just after 10.11.2 update.

I should not have to do anything to correct this bug, Apple should do it. Or better not create new bugs with updates.

Lots of money indeed for not even having a correct wifi connection.

Sad

Yeah my iMac mid 2011 WIFI is a bag of spanners to after the 10.11.2 update. To be honest its never been great since the El Capitan upgrade. 10.11.2 has taken the issue to a new level. It think my mum could do better QA testing.

Same exact problem with the same exact machine (MBA 13 inch Mid-2013) I have done every possible troubleshooting for this to no avail. It seems to be the driver crashing after load. I am utterly amazed that Apple hasn't pushed a fix for this yet as it is critical bug for users of this the models effected.

Appreciate this will not help in the short term but have you all tried reporting the issue via Apple Bug Reporter, it only requires your Apple ID to sign in.

https://developer.apple.com/bug-reporting/

If they are aware of an issue you normally get a quick response (through the system) which basically states "Duplicate" of a previous report and it's reference, if it's new they may ask for additional information.

I did this, but no response from no one in Apple still.

It's a real shame, since I can't keep a connection I can't do a Skype conversation, the rest is a hassle.

Just for the heck of it, trying creating a new user and create wifi connection in that user and see how it does--plus if it works you might be able to Skype with it or transfer your info to the new user. I've had that work at times--not this particular issue but other network problems.

You will only get a response if they are already aware of the issue (i.e.. this is a duplicate of....) or they request further info from you to assist them in a resolution - the main point is that you have notified them by the correct method. If all those having the problem do the same it may get a higher priority from Apple, in any case, you have done all you can to help bring the issue to there attention.

Although they may look in on this forum we can not expect a "personal" response because that would be impractical, for that one would phone Apple Care, but there are those that do try and help, namely other members - but we just have to be patient because even for these "high level" types some issues can be difficult to narrow down.

It does not help but my 2013 iMac running 10.11.2 has rock steady WiFi so it might only be an issue on certain models which therefore might point to one particular bit of hardware from a certain manufacture or period. Frustrating, yes, but if enough report an issue Apple are usually quick once aware to bring out a fix in future updates. Sorry can't help any further.

One idea, have you looked at the router - I have a Netgear DGND4000 which has both 2.4/5.0Ghz wireless connections, for whatever reason 5Ghz has not proved a stable connection (under Yosemite anyhow, not tried with El Capitan) and would drop for no apparent reason even over night when not in use. 2.4Ghz on the other hand will go for months and has proven very robust when downloading from any external interference.

The point is, although your other devices may work on the wireless setup you currently have, can you change a few settings and see if it makes any difference to your Mac - better still, could you barrow another router. I've often had issues and blamed one particular bit of kit to later discover it was caused by something entirely different. Just a thought.

Still, thanks, but you are not helping. Didn't you read that before the update everything was working? And yes tried everything, but still have WiFi disconnection.

Two points, firstly was trying to explain and answer your "Isn't anybody from Apple monitoring this forum go give an answer?" and "I did this, but no response from no one in Apple still" because going on about Apple not replying will not achieve anything towards resolving your problem.

Secondly, was not aware you had tried everything! - but you might want to consider although the stability issue occurred following said update, changes to you wireless setup could still improve things (e.g.. switching wireless channels to avoid possible interference from adjacent networks).

Well, the thing you have to understand is that after an update that tells that will fix WiFi instability caused WiFi instability in my case.

Well yes, tried many things.

Started with resetting all, PRAM, NVRAM, SMC, etc...

Then tried many settings on my router to make it the most welcoming possible, changed channels etc...

Then re-installed El Capitan from Recovery Assistant, NOT using my backup drive, but Install from the Internet, that btw took a lot of time. And I found out that in Recovery Assistant mode it didn't have any problem with WiFi.

So, I'm lacking options here. That's why I'm kind of frustrated, dunno if you can relate to that, I get Wifi disconnection sometimes more that 1 every 10 secs.

Yes, I do understand your frustration, been in the same position a few times in the past and it can feel like you are bashing your head against a wall sometimes - but from my own experience these situations can make you blind to the more obvious so was just offering up some thoughts, but in your case it appears you have tried what I would have done. Your discovery regarding network improvement under Recovery Assistant Mode is interesting and might give others that are a bit more knowledgeable a clue to what's going on, why don't you give Apple a call with what you have found out, should not cost because it's on the back of El Capitan upgrade issue - worth a try.

This is definitely a 10.11.2 issue - I have been trying to find out if there is anything I can change on the WAP to stop the packet loss.

The past couple of weeks have been annoying, especially as I keep getting booted of a VMWare Horizon View session.

I have noticed in the WAP logs the following.

Dec 23 10:42:29.761: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 2 AES-CCMP TSC replays

Dec 23 10:42:35.761: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 2 AES-CCMP TSC replays

Dec 23 10:44:34.750: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 5 AES-CCMP TSC replays

Dec 23 10:51:29.740: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 3 AES-CCMP TSC replays

Dec 23 10:52:15.745: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 3 AES-CCMP TSC replays

Dec 23 10:58:42.732: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 1 AES-CCMP TSC replays

Dec 23 10:59:02.732: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 10 AES-CCMP TSC replays

Dec 23 10:59:10.728: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 3 AES-CCMP TSC replays

Dec 23 11:02:19.737: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 1 AES-CCMP TSC replays

Dec 23 11:02:32.731: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 1 AES-CCMP TSC replays

Dec 23 11:03:29.718: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 3 AES-CCMP TSC replays

Dec 23 11:04:45.716: %DOT11-4-CCMP_REPLAY: Client xxxx.xxxx.xxxx had 5 AES-CCMP TSC replays

From the Cisco error messages description - AES-CCMP TSC replay was indicated on a frame, hence the frame was dropped for security reasons. A replay of the AES-CCMP TSC in a received packet could be caused by an active attack or by wireless client nonconformance to the 802.11i standard.

So it would appear that Apple has broken something, and not conforming to the 802.11i standard in 10.11.2 - what they have changed I don't know but it would appear to be AES-CCMP encryption.