Q: OSX Yosemite Wifi issues

And the formal release of 10.10.4 prevents my WiFi from functioning again. I finally had Bluetooth and WiFi working together with the final public beta, then installed the public release. Now Bluetooth kills WiFi again.

So 10.10.4 is no different in this respect from 10.10.0.

Terrible.

Try factory resetting your wifi router again. Also, perhaps permission rebuild/SMC reset/PRAM Zap and deleting the NetworkConfiguration files might help.

That's a bummer!

-HTD

Thanks HTD. I reset the modem again and now all is fine.

This is odd.

Has the latest Yosemite update released today fixed this for anyone?

PLEASE HELP

sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

NOT WORKING ANYMORE AFTER 10.10.4 UPGRADE

WIFI BACK TO 1 to 10 Mbps when I reached 200 before...

What type of wifi router are you using? Have you tried factory resetting it? That worked for me and one other in the thread.

I've found the trick again

sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

Works like a charm now, WiFi on Macbook is back to 200/300 Mbps!

http://arstechnica.com/apple/2015/01/why-dns-in-os-x-10-10-is-broken-and-what-yo u-can-do-to-fix-it/

Well, have updated to Yosemite 10.10.4 and wi-fi is still dropping out. My Macbook Air is so unreliable it's untrue! All other devices in the home work with no issues whatsoever and pre Yosemite the Macbook Air worked perfectly.

Any suggestions? Basically wi-fi drops out intermittently and the only way to resolve is to turn wifi on and then off again (on the Mac).

I finally managed to fix my issues a couple of days ago. Rather than the completely unable to connect/random disconnection/bluetooth issues which seem to be the majority around here, my issue was specific and recreatable - to do with no wifi connectivity when opening the lid for 30 seconds to 1 minute.

I have a British Telecom (BT) Home Hub 4 router. After first upgrade to Yosemite, my rMBP (mid 2012) when opening the lid to come out of 'sleep', would then take 30 seconds to 1 minute to reconnect to my wifi. Sometimes it would then lose connection again after a further 10/15 seconds. Sometimes it wouldn't connect at all. In either of those cases, turning the rMBP wifi connection off and on in the top menu would then establish a working connection after a further 30 secs to 1 minute. After that, the wifi connection would work perfectly until the lid was closed, then rinse and repeat.

I had previously tried the removal of all of the 'cloud' based access points and re-connected, but I am unsure if this had truly happened or if another device had remembered some of the settings. Either way it didn't fix the behaviour. Finally, after months of checking this thread I tried a different approach and found this post on the BT support site: https://community.bt.com/t5/Other-Broadband-Discussions/Macs-drop-off-and-won-t- connect-to-BTHub-Macs-and-BT-Broadband/m-p/1444319/highlight/true#M102321 (in particular the 7th post by Chrissmith92).

They suggest splitting the router's automatic setting for frequency and separating the 2.4GHz and 5GHz bands. I did as suggested so that I now have 2 available SSIDs - the new 5GHz one I have named with a 5 on the end. First tests against the original SSID (which I did not rename) were good - my rMBP was no longer exhibiting the old drop out behaviour  after opening the lid. I then tried my rMBP against the new 5GHz SSID (expecting the old behaviour to return), yet this now worked too, and has now been working solidly for 2 days.

Due to the number of varying problems around this area this is obviously no silver bullet. With to the number of moving parts (O/S updates, router firmware auto-updates, new hand off functionality, new stack, cloud SSIDs), I'm still not sure where the real fault is, but this may hopefully help some of you, or give more clues to dig deeper.

In summary:

My issue: No wifi connection for up to a minute when opening lid

My machine: Retina Macbook Pro Mid 2012

My O/S: Yosemite 10.10.4 (14E26a)

My Router: BT Home Hub 4 (firmware 4.7.5.1.83.8.130.1.26 (Type A))

The fix: Router -> Advanced settings -> Enter the admin password from the card on your router -> Continue -> Wireless -> 5GHz -> Sync with 2.4GHz: No -> SSID: add a 5 at the end so you can tell the difference -> Hit apply -> Connect to original SSID on Macbook -> Connect to new 5GHz SSID on Macbook -> De-stress the last 6 months and have a beer.

Cheers

IN SUMMARY

10.10.3: this trick below would work until you restart your computer:

1. open Terminal

2. type: sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

3. enter your password and enter

4. type: sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

Now that this lame 10.10.4 release is out: this trick below works BUT ONLY until you open your lid again or restart your compuer:

1. open Terminal

2. type: sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

3. enter your password and enter

4. type: sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

Does anyone know how to run a script automatically whenever I open my lid, that would WiFi with the latest trick (unload and load mDNSResponder)?

Otherwise I'm back to 10 Mbps all the time. It is so annoying.

Thank you.

Thanks Turnbull, this is interesting - I too have a BT Home Hub 4 - I'll give your suggestion a try.

It would be interesting to see if resetting your BT Home Hub wifi router to factory defaults does anything to the issue. It seems to have fixed my problems.

So much for resetting the modem; since installing 10.10.4 my WiFi is now unreliable whether or not Bluetooth is enabled. Loading any webpage is now a challenge.

What a joke.

Perhaps Apple should offer full refunds for all Bluetooth accessories purchased ?

No Change. Worse if anything. But I wouldn't expect change since the public version is likely going to be a rebadged version of the last beta. Labeled as "no known issues" HA laugh at that every-time.... My replacement Wi-FI module arrived yesterday. unfortunately I have to wait until my current deadline is up. I think the dongle issue I was having is just a sleep issue with the USB port, so otherwise seems to behave normal. Easy to get upset about network issues these days.