Q: OSX Yosemite Wifi issues

Have you tried to turn off bluetooth?

I agree, there is something deep in Yosemite that is causing this conflict.  Seems like some fixes help certain people, but I wonder if their fix is really giving them full wifi speeds.  I was a bit startled by how much faster my wifi was after I turned off the bluetooth devices. 

FYI - I upgraded my 2007 iMac and it went smoothly, wifi continues to work great.  That thing will never die!?

I would agree with everything you say (macbook pro early 2011)

Started with Mavericks 10.9.4, got much worse with 10.9.5 and persists with a vengeance in Yosemite

Mac hardware and software and router specific I would say.

Tried everything in the book and everything you have done re clean installs etc.

many things seem to provide a temporary respite, which is even more peculiar.

I have also found situations where making the WiFi inactive in network preferences will crash the computer requiring a power off. Something is amiss.

(my bluetooth is off)

Yes -- Mavericks too had unusable WIFI -- IF @ 2.4GHZ and BlueTooth Enabled or Bluetooth Devices in close vicinity..

Killing Bluetooth around it - would always in my case fix it.

I know you are all referring to WIFI here but the problem is also on the LAN as well so should be zip to do with any radio frequencies , i use my MBP all day to remote login into servers using the LAN and WIFI so am in a good position to be able constantly monitor connectivity and to me it appears to be a security issue, because it takes a long time to make the connection no matter what protocol is used, so it must be doing something else on another layer (probably a security layer) and since 10.9.3 I have logged into thousand's of different devices with the same issue so it must be my MBP thats at fault also the fact i have no issue transferring files to my MBP means its an outbound issue.

i did a test where i logged into a server from my MBP and ftp'd a 10G file back to my MBP ( so not a get but a put  i.e. my MBP isn't requesting anything)

the ssh connection OUT dropped but the 10G file carried on transferring IN

so clearly an outbound issue for me

I read somewhere that there are some sort of new security checks done on the kexts so maybe this is what has made the original unresolved 10.9.4 issue worse

YES There are two issues with Yosemite

1) BT interfering with WIFI

2) Full WI-FI but NO ability to resolve to any server.

Those are completely diff. Issue. As has been pointed out already in this mammoth thread !

I never use BT on my MBP because if i do it takes over my iMac trackpad and turns the magic mouse into a trackpad so every time i pick up the mouse it sets the pointer to the top left corner and it takes an age to get it all back

sometimes I'm scared to have all my apple stuff in the same room cause you never know what the bluetooth is gonna do!!!!

but I find that with most apple stuff of late! if you stand on one leg face north and close one eye it works

well for 5 minutes anyway

meant to reply to thread, not one person.

You *should* be able to fix your problems by removing ALL network interfaces, quit System Preferences, open System Preferences and re-add each interface you have/intend to use.  YMMV!  Works for me anyway ... also wouldn't hurt to QUIT ALL APPS, repair permissions, repeatedly, until NO PROBLEMS are listed, THEN reboot.

Just wanted to update you all on my progress with Apple.

Last week, I was escalated to an engineering contact, and ran a bunch of diagnostics to capture packet traces through a failure.  They weren't able to find a fix with that packet trace, and so I've just been on the phone again, capturing a second different round of wireless diagnostics to try and support a fix. 

It would seem that Apple Engineering are actively trying to replicate the issue, so that they can affect a fix ... and will call me back and update me in the next few days.

I continue to encourage you to spend the time on the phone with Apple Support; if they cannot fix, then you can participate in providing the information that will help them find a fix for all of us.  One data point doesn't offer a trend, so the more of us sharing diagnostics at a point of failure, the more likely a fix is.

Steven

Hello everyone,

I just gave a shot changing the encryption settings on my wireless router and it worked!

My previous setting on my home router was personal WEP and I changed it to WEP2 Personal(or WPA2PSK + AES).

I'm not sure it was only me but now I have no problem with Wifi on Yosemite.(since last 6 hours)

Cheers,

Charles

Just wanted to add so I don't have to create a new post.

WiFi drops frequently both at home and office network. Magic mouse also disconnects all the time.

MBP Retina 15".

Same issues, wifi drop both BG and N band. This is getting very annoying, I am thinking about going back to mavericks!. Thanks Apple !

Recently upgraded to Yosemite on my MB Pro 13" Retina, and immediately started experiencing issues with my internet connection not responding despite the WiFi connection itself not dropping out.  Only way to get access back was to continually disable and enable my Wifi connection.  At the same time I was only seeing my 2.4ghz and 5ghz networks which broadcast SSID sporadically.

Seemed to have solved the issues with a combination of the solutions suggested by KieranN92 - (I just got in touch with an AppleCare representative, you can potentially try resetting the System Management Controller, there is an article here on how to do this, and it's easy and safe Intel-based Macs: Resetting the System Management Controller (SMC) - not sure if this is the solution for everyone, but I have had some success so far, lets wait and see how long it will last!) and mamaricci - (I just tried something, which so far seems to be working. Go in to your Keychain access - System. Find your wireless network - double click. There are two tabs, Attributes & Access Control. Go into the Access Control and check "allow all applications to access this item". Mine was defaulted on confirm before allowing access, which I think was knocking me off every time I tried to do anything.)

Network speeds when browsing etc. have improved significantly and no dropouts since doing the above !!!

Hi

Perhaps Apple is working on a fix for this as the Beta 10.10.1 as according to AppleInsider:

"With the first test version of Apple's upcoming Yosemite maintenance update, dubbed build 14B17, Apple asks developers to focus on Wi-Fi, Exchange accounts in Mail and Notification Center."

link:http://forums.appleinsider.com/t/183221/apple-issues-first-os-x-10-10-1-yosemite -beta-seed-to-developers

I'm glad and not surprised that apple is working on the fix.

HOWEVER, why do they need you to supply them with info about the error. This is curious. I suspect that they have a (large) number of apple computers running Yosemite. It is inconceivable that they have not seen this problem