Q: Yosemite killed my wifi

Since I upgraded my wifi  broadband box to dual band the issues started then I went back to single band and every thing is ok again so there must be a conflict with duel band I live in the uk and use Virgin Media.....I am now using the Virgin Media box as a modem and using my old router as the router...

Works fine on a 2014 MacBookPro, drops out about every 5 minutes on an iMac mid 2013. Very frustrating. Tried a lot of things without success. This should be solved by Apple really quickly!

Same problem, now on two MacBooks. Thought it was a router / ISP issue then I pulled out a really old thinkpad and it rocked the wifi connection while my macbook timed out and delivers at best 1/2 the download speed of the thinkpad.

Sadly 'upgraded' another macbook and its failing WiFi connections at numerous locations.

Something his broken.

I've upgraded and it has effectively killed the wifi network. I can't get a connection with any device now from within the network. From what I can see the OS seems to have changed IP address settings and it is causing a clash. This release is looking like a disaster. I would recommend everyone stays away until Apple sorts it out.

It worked for me fine for a day and then BOOOM - no connection to the network.

For me, my wifi just got extremely slow after installing Yosemite on my MacBook Pro. Also takes a long time to boot up in the morning. Very annoying.

do you need that folder restored (empty) after the re-boot?

This didn't work for me. I've read tons of posts and followed al the steps.

The only thing that did work for me was to keep the network active. As found on one of the security blogs tracking this problem, here is what is working for me.

Create a text file. Paste the contents below into it, and save it as "wifi.problem.sh" to your Documents folder.

#! /usr/bin/env bash

while true; do

  echo "$(date -u): \c"

  dig @8.8.8.8 +tries=1 +time=3 google.com | \

          grep 'Query time' | \

          cut -d ' ' -f 4 -f 5

  if [ ${PIPESTATUS[0]} -ne 0 ] ; then

     ifconfig en1 down

     ifconfig en1 up

     echo "--> Bounced en0\n"

  fi

  sleep 5

done

Then open Terminal, and type/paste this in: sudo bash ~/Documents/wifi.problem.sh

Enter your admin password.

All this is doing is looking up Google's network information every 3 seconds.

Minimize the terminal window, and leave it running.

My problem has been solved and is now working fine. It turned out to be a combination of two circumstance. I use a BT broadband router and have been using an Airport TimeCapsule for occasional data storage. When I upgraded to Yosemite it sought out and prioritized the TimeCapsule and tried to use it as the route. It then changed the system and network IP addresses for the router, when inside the network, to an address that didn't work. It through off every device. Iphone, ipad, laptop and desktop.

Timecapsule has been reconfigured and the wifi setting deleted from each device. They have been added again which brought the router back to the BT router, and all is well for me know.

After a week of trying different solutions with out any luck I just magically solved the problem. I restarted my machine, which I did a few times before, but instead of going into my normal user I went into the guest user and tried connecting to WIFI which it did perfectly so I then logged-out and went to my normal user and Bingo! WIFI worked perfectly.

On another topic: How do you guys feel about Apple's new policy of staying quiete when confronted by big issues such us this WIFI problem? As far as I know WIFI is still a widely used technology and key to any laptop user.

Shortly after installing Yosemite I ran into the same exact WiFi issues everyone else is describing here. There are actually an overwhelming amount of articles posted across the internet in relation to this! I've also tried every fix list here. My efforts have included but are not limited to:

- Install new network location

- Delete and reinstall WiFi connection

- Reset SMC

- Delete bluetooth.plist

- Delete System Configuration

- Turn off BlueTooth entirely

- Turn off iCloud Drive

- Turn off "Handoff between two computers"

- Turn off Safari in iCould

- Turn off Keychain in iCloud

- Go into Keychain and change Access Control

- Removed all Network Configuration and Preference Files:  com.apple.airport.preferences.plist, com.apple.wifi.message-tracer.plist, NetowrkInterfaces.plist, preferences.plist

What happens is that it seems that some of them help to initially solve the problem but it almost inevitably reoccurs and the connection comes to a standstill yet again. Clearly there is an enormous issue here. Unfortunately I'm in Europe on business for 90 days so there is no hope of any Apple support and this has brought my business dealings to a complete stop!

APPLE YOU HAVE A RESPONSIBILITY TO FIX THIS DEFECTIVE SOFTWARE!!!!!!!! STOP IGNORING YOUR CUSTOMERS!!!!

wrong response, sorry

bkolas,

Your problem is very similar to mine; the only thing that keeps it going is an active connection. Read above for my fix, and let me know if you need help implementing that fix. I realize it's apple's job to fix it, but keeping that connection open has remedied the problem until apple provides that fix.

Will

I agree with your assessment: I also tried changing WiFi Channels, rebooting, etc., in addition to a few of the other remedies you mention. None of the advice works for any extended period of time. I worked on four different WiFi networks on four routers, two 5 GHz and two 2.4 GHz, and the problems of unstable connection and low throughput remain the same. No problems with three other Macs running Mavericks on these networks. Keep warning people against Yosemite until this gets fixed. Amazing that Apple has not reacted yet...

The problem only exists for me when I am at work using WPA2 Enterprise security and from reading other posts other people report the same.

None of the fixes listed work and I suspect a software fix is needed from Apple as this didn't exist prior to install the official Yosemite public release.

I've had WIFI drop out problems since Yosemite. The bluetooth theory doesn't work for me as I had that on Mavericks and permanently turned it off which solved it for Mavericks but not Yosemite. I'm now thinking the actual problem may be Safari as I have been using Firefox today and have had no drop out issues at all including wake from sleep. I have multiple brand routers and it makes no difference. Early 2013 Macbook Pro Retina display.