OSX Yosemite Wifi issues

jalovette, maybe this will help. After trying numerous suggestions and having no success, I realized although I had looked at my system library preferences and everything looked normal, I hadn't checked my User Library Preferences in my Home folder. I've included an image of what I found,

You'll see there are numerous duplicates, and in some cases like Bluetooth, triple plists. Multiple plists cause system

conflicts since they almost always have different prefs, Your system simply doesn't know what you want to do, so it quits trying.

What I did was to delete all the prefs in my home folder, did a shutdown and restart. Then I shut down again this time doing

a PRAM reset on startup, and everything has worked well since then. I had to reset my prefs for the plists deleted, so you might

want to write down which ones you're deleting so you know which ones you may need to reset if you choose to try this. I've been running all

day with no problems I'm aware of. Internet is running like it did in Mavericks. Both system and user pref folders look normal.

I submitted a feedback report as well. I've tried everything listed in this thread with no luck so far. My anecdotal evidence:

1. This issue only exists for me at work, where I have no control over the Wifi settings. At home, on my 5ghz Linksys router, things run smoothly with no issue.

2. Bluetooth settings don't change anything. Neither does enabling/disabling Handoff.

3. Deleting and re-adding the networks did not work.

I Option+Clicked the Wifi settings, ran wireless diagnostics, and elected to let it continue to run while I was working. I encountered a strange occurance in that the monitoring software did not detect any issues with my wifi, even when I was obviously having issues:

The monitoring diagnostic tool did spit out an error report which seems very detailed, I'm pouring over the logs right now to see what the system was doing but there is a lot of data to sift through. Anyone know who I can send this report to at Apple?

Edit to add: It seems there are these driver events associated with the connection dying. Not sure what these are exactly but they seem to last as long as the outage does:

Thu Oct 23 06:27:11.095 Driver Event: <airportd[29]> _bsd_80211_event_callback: LINK_QUALITY (en0)

Thu Oct 23 06:27:11.096 Info: <Wi-Fi Menu Extra[304]> link quality changed

Ignore your system library, it's fine, the plists to toss are in your Home Library. This is what my Home plists looked after I downloaded Yosemite.

This is how it looked after deleting and rebooting

Everything is working well since then. Of course you'll have to reset your personal prefs in the apps, but it's

worth the effort and it will relieve the aggravation.

Unreal. I do know how these things seem to happen but my system is humming along. Here's a pic. WiFi has been great at Hotels, Starbucks and on BBX ( Marina Wi Fi) Here is my iMac at 0050 PDT, Oct 25

Try this, it worked for my brother and now (yea) me. Open your HD, type .plist in the search. Make sure you're searching "This Mac". This is an image of the results he received.

Next, highlight one of the plists, I did a Bluetooth plist. On the bottom of the window you will see the path to that plist. If you do not see the Preference Folder in the path, it's a duplicate in the wrong app/program folder and will not run properly. Turns out all these were that way except the Booklist plist. He deleted CMD+DEL all the files in this window. Then he did a shutdown. When he restarted he did the search again and this is what came back.

All the other files had been placed in the proper folders and everything was working properly, and his has for 4 days running. After I did this I checked to see if my old prefs had changed and they didn't. Later, I also did a PRAM reset for the heck of it and then a permissions repair. FYI I'm using a early 2013 iMac 21.5

What a relief, I hope this can work for you also.

My home WiFi via Cable Router, Airport Extreme as captured on a late 2013 Core i7 Fusion iMac.

Guess I'm one of lucky ones for a change, no problems on this and two laptops on either my home network or when out and about with laptops ( MBP's 2008 is slow but only 2GB ram but holds signal on a marina WiFi ), the Mid 2012 Retina with 16GB ram opens from sleep with no problem.

All had been on Yosemite thru four public Betas . I took Apple's advice and downloaded and installed final release.

So far, all humming along.

Hopefully those suffering WiFi problems will soon enjoy what I am. We've come a long way from OS 7.5.5 and the old dial up modem.

A snap n drag pic of my ISP SpeedTest via home WiFi

Just checked my Apple TV. Is the 2nd model (720p), works perfectly with my Library in iTunes 12.01.26 and iPhoto 9.6 (910.29). So I guess all I can offer is that Yosemite 10.10 , via Airport Extreme is working fine for me.

Maybe being in Public Beta program set up my system differently. I must add that I run Disk Utility via Command+R at least once a week and I usually shut down my iMac every night via the auto shut down in Cocktail after running Pilot in Ver 8.0.

Of course once can use the free YASU. ( see Macupdate http://www.macupdate.com/app/mac/13416/yasu )

ONYX is yet to be updated for Yosemite.

Definitely bluetooth related on on my Macbook Pro 15 late 2013

Bluetooth off

Bluetooth turned on and one device connected (Apple trackpad)

Nothing changed in-between the two tests other than turning on bluetooth and connecting the track pad. Wifi is rock solid stable with bluetooth off and has been for days. Come on Apple sort it out, has to be enough evidence in this thread alone that there's a problem.

i had somehow problem with Mavericks on this issue, and also with new Yosemite... anyhow i think you can solve the problem to give the WiFi the correct protocol from the menu you can se on the attached picture below, the fourth counting from topp in WiFi/Ethernet menu (text in Swedish).

I erased what i didn't need and what i needed and my WiFi and also had problem with Ethernet, so i erased everything and added the once i now i only use.

Hope that will do the trick for you :-)

Remember always to do an.... "Repair permissions" to your OS X, before you do an OS update :-)

And also you can do this after the update.

Otherwise always good to do this once a month, to make the "repair permissions"

(sorry about the text on pic, its in Swedish) This is the "Disk Utility", you can find it in spootlight

Well, I'm glad to see that it's not just me but I'm a little amazed that this thread has over 1,300 posts and over 250,000 views! I have 4 apple airport extremes spread out over or property while Mavericks had some issues with bluetooth interfering with wifi, this is much worse. I have a nice movie of my system cycling through various connections followed by drops and Network Diagnostics repeatedly asking me for keychain access even though I say "always...".

I finally got a quasi-stable connection but even after that, Airport Utility still thinks the airports are unavailable:

This is quite frustrating and can be a real problem. Unfortunately, this thread is so unwieldy I don't know where to look for a workable answer or if there is one.

Tom & uva14 --

Bluetooth seems to be the core of the problem. I'm running a 13" MacBook Pro Retina 2014 with Yosemite installed. I have a 3T Airport Time Capsule and it sits on the desk near the laptop. As a diagnostic tool I'm running WiFi Explorer (in the Mac Store and highly recommended). I will attached two images from this tool. The first shows typical 2.4 GHz (BROWN) and 5 GHz (BLUE) signal strength in my "normal" configuration (laptop cover closed, Bluetooth ON, and a Thunderbolt display, keyboard, and track pad in use). Notice that the 2.4 GHz line (BROWN) drops repeatedly for up to 1 minute.

The second image shows what happens when I raise the laptop cover (to use the keyboard and trackpad) and then turn off Bluetooth. In this image I turned off Bluetooth at exactly 19:15 and 30 seconds. You can see that the 2.4 GHz channel is solid and stabilized as soon as the Bluetooth was disabled. I let the display run and the second image shows good stabilization.

To MiguelID -- I tried the KeyChain Access modification you recommended but it didn't change this behavior.

The problem is clearly a Bluetooth problem but one that would be less of an issue if the laptop and the Airport Time Capsule were not in the same room. I plan to experiment by putting a piece of steel on the side of the Airport Time Capsule that is closest to the Laptop to see if some isolation can be established.

And the wifi icon in the menu displays a grey symbol with a cross through it, even as it managed to load Google's page before failing again.

This one?

NOW we've got your issue by the tail, ausappleuser! That sign means a hardware issue, possibly only becoming obvious through upgrading. There have been some reports in this thread that all WiFi problems were solved by replacing the Airport card and cable. Well, this seems to be your issue.

If flashing it to the newest firmware doesn't work, have the card replaced.

I bet your Airport card has a Broadcom chip on it. Seems to be notoriously flaky these days.

OS X: Using The Wi-Fi status menu - Apple Support

Good luck!

I Just realized why my wifi is working again. Re-installing Yosemite put me back on version 10.10.1, which never was a problem for me with Wifi. I'm going to upgrade to 10.10.2 and see if the problem of not being able to connect to Wifi re-occurs. Crossing my fingers ... which seems like dealing with MS Windows again.

I just upgraded to 10.10.2 and my problem is still there. I'm not sure how many different issues there are with WiFi in Yosemite but i've been working to characterize mine. In summary, we have a house with 3 airports providing both 5GB and 2.4GB networks. My problem seems to arise when I move out of range of a 5GB signal and either attempt to drop down to 2.4GB...or... I try to move from one airport to another.

What is concerning is that I see various failures on the Network Diagnostics screen. I'm pretty sure I've seen the Network Status fail at every setting but Server:

Sometimes there seems to be a series of failure and my laptop just gives up on Wifi, putting an exclamation point on the Wifi icon in the menu bar. Additionally, sometimes the system seems to forget that it knows the password to the Wifi Network (note that the Network Status switched to "Wi-Fi Settings" failed):

The other thing that has been worrisome but I've seen this long before Yosemite is that the system never seems to remember that I regularly select "Always Allow" when it asks for access to my keychain. For some reason, Network Diagnostics never remembers that I've previously given it on-going access.

Here are the stats on my MBP:

Here is what my Wifi network looks like:

I'm stumped on what else I can do except maybe turn off the 5GB network.