wifi problem with yosemite 10.10.2

For those of us having "can't connect to wifi network" problems (versus performance problems), I'm liking this theory.

Pre-Yosemite, I sometimes was not able to get the WiFi splash screen at the office and hotel I frequent. (Both using Cisco WiFi network infrastructure as far as I know.) My theory was that if you connected to the network but didn't login through the splash page in a certain timeframe, your MAC address got black-listed as a means to preserve network performance. It might work a few hours later, but...

The fix: 'sudo ifconfig en0 ether xx:xx:xx:xx:xx:xx' (with a new random address), turn WiFi off and on again and then I'd get a new DHCP provided IP address, hit the WiFi splash screen and away I went.

Under 10.10(and .2 especially), I can connect to these WiFi networks and get a DHCP provided IP address including the router's IP address. An attempt to ping that router address on my hotel network yields a response, but I can't get traceroute to route a packet beyond the router's IP address. On my office network, I can't even ping the router. In both cases, I can't even ping the DNS server.

Otherwise my Mac connects up to other WiFi networks (like WPA2 networks) or my home network with no issues.

Something is blocking the routing of IP packets and I'm guessing it's Cisco's network protection mechanism not being compatible with Apple's 'MAC address randomization'.

So, anyone know how to turn off this MAC address scrambling 'feature' in Mac OS X?

I give up debugging. Waste of time. The problem just keep coming back.

For now my solution is to use my old AirPort Express as wireless bridge, connect to my iMac Retina via Ethernet. That works for me since mine is a desktop. Maybe you guys can get a cheap Wi-Fi USB adapter as temporary solution until Apple come up a patch for the WiFi issue, permanently.

Hi Guys,

I have the same problem with my new bought imac. It isn't a week old and now already having these problems.

The problem that I have is that I can successfully connect to my wifi, only it is dropping once in a while. When that happens the wifi icon is still displaying as connected to my network.

Yesterday I contacted the Apple support and we did tried out some fixes, but none of these fixes helped me to fix the problem.

Today I will get called by the wireless department from Apple, in like 30 minutes.

I will let you guys know if there would be any fix for this.

Then its good that we both have this "problem" so its depending on version 10.10.2. I prefer not to change it back because its just a brand new iMac and its just supposing to work! I will let you know we find a solution!

Hi Guys, I've been having the Same problem with my Macbook Pro 4:1 I know its an older mac but its running 10.10.2 really well and I'm running PS 5 on it. so I checked everything to try and fix this changed my router settings etc

In our house we have

6 Ipads.

3 iPhones

3 Ipod Touches

2 Macs.

1 Apple TV

Everything else was working perfectly and I was getting so frustrated. I just turned my bluetooth off and its working like new again. However I hope this is just a short fix as I was using a Magic Mouse,trackpad and a wireless keyboard. Im getting a new iMac and macbookpro later this year So I just hope i don't have the same problem as bluetooth is really useful for me. ! Hope this is helpful for those still having problems.

Matty.

Yes, but if I turn off the Bluetooth, I will not be able to use my iMac (no mouse, no keyboard) LOL. I can go to bed or buy a Microsoft one.

It's better to restore 10.10.1 and waiting for Apple to move their back to propose 10.10.3 and fix definitively this problem for lot of people.

François (FRANCE)

Yeah it can be a real problem for a IMAC, I'm looking to get myself one and now I'm having second thoughts.

I seen this try this .

GO into system preferences, then click network.

After that click "Advanced"

Then there should be sort of a toolbar of options. CLick the last name named "Hardware"

Click the button that says "automatically" and switch it to manually. (Configure)

Then click the button below it and change Standard to Custom (MTU)

Then the little number scale that says 1280-1500. Manually change the number to "1453"

This didn't work for me thought.

As I returned to Yosemite, hoping the issues were resolved, it wasn't fixed so this is kind of atrocious.

I'm not happy with OS X and I want it fixed regardless!

I've tried a diagnostics which seemed useless, as none of the suggestions provided are even related (my router is just right there!), and even with my mobile data plan it still kicks me off with a "No network connection" or just plainly kicks me off and won't let me be able to connect.

Not just a diagnostic, I even attempted using the Wi-Fi with a Wi-Fi dongle and it still didn't resolve the issue. So it's down to the OS itself, which is a shame really as I actually been told it was fixed yet upon reinstalling OS X with a CLEAN install to not have any conflicting issues. So this is a downer.

I'd return to Mavericks but I'm not in the mood of doing so, I prefer to stick with Yosemite. Just fix these issues, Apple.

I definitely blame Yosemite because I have many devices including iPhones with no trouble connecting. I even have another Macbook Air running Yosemite with no issues but was natively installed with Yosemite. The Macbook Air (same Model 2014) upgraded from Maverick to Yosemite has many WiFi issues. Including loss of connection after sleep, maintaining WiFi but losing internet. Its at least to the point I can fix it by turning off WiFi and turning back on. My personal feeling

is its not related to anything WiFi but a issues with Keychain getting corrupted and not properly addressing sign in password security with router. Its weird that if I am having problems I can run the Network troubleshooter and instantly it fixes the connection? As if their is some sort of handshake issue between this one device and the router. The question for me remains, how can the same model of Macbook Air that came with Yosemite work perfectly fine with WiFi. But the one that got the Yosemite update does not? I am reluctant to perform a clean install of Yosemite at this point, given my MBA is a duel boot system with BootCamp and I don't care to disturb that portion of my MBA which I use more then Yosemite. But if you really want to solve the WiFi issues. It does seem a clean install might be a solution for some.

Hi. I just did a clean install of 10.10.2 on my Macbook Late 2011 and it exhibits the problem with the WIFI. tried several things in this thread but same results.

I guess a clean install does not help for me. 😟

Apple should be ashamed of this.

It's nothing to do with the router... I have 2 phones, 1 extension and 2 laptops attached to mine currently and only one is struggling with it's wifi (the one running Yosemite 10.10.2 (solutions appreciated))

Apple are conspicuous by their absence in this and a load of other forums with the same problems.

The only way I can deal with this after the upgrade that just sits in my app store, lit up and annoying the f**k out of me is to use a Yosemite installation that I saved onto an external drive (it's a big file and typically, deletes itself after installation) when I upgraded my older 13" MacBook.

I don't even look to upgrade the OS now and even when I do... I just have to roll it back again... there's always something that gets screwed.

Perhaps Apple believe that wifi is a non-essential element..? ffs..!! and this is a 'cloud' friendly OS..?

I totally agree. I had no issues with Maverick on same router same network. I run Windows 7 in BootCamp same router same MacBook Air and no network WiFi issues. Then I upgrade to Yosemite and have lost WiFi saved connections, lost internet while maintaining local connection and total loss of WiFi in Yosemite. Yes, no doubt in my mind this is a Yosemite issue and not a hardware or third party device issue for me. My solution has been to use Windows 7 in BootCamp almost exclusively anymore because I got tired of messing with Yosemite. I certainly am kicking myself for upgrading from Maverick. Even more sorry I traded in a perfectly running 2010 MacBook Air with Mountain Lion for a new MacBook Air running Maverick. The only reason I did not return my MacBook Air and buy a PC laptop was the fact I at least can run Windows natively and its stable.

Ive spole to Apple Care twice now, on both occasions they have not heard of this problem and have told me its a hardware issue and I need to take my Mac to the Apple Store for repair, I'm not sure this is the correct path!

In my case I doubt highly its a hardware issue. Mainly because the Windows BootCamp uses that same hardware flawlessly. Now, its possible that a driver for the hardware in Yosemite is corrupted or skewed in some way? Some say doing a clean install of Yosemite rather then a upgrade provided the solution for the WiFi issues. Case in point my Daughter bought a MacBook Air with Yosemite installed and has had absolutely none of the issues I have had with the same MacBook Air. Except that mine originally came with Maverick which I had upgraded to Yosemite. I personally believe since some have these issues and some don't. Does lead me to believe we are seeing more of a system corruption problem that's maybe more apparent with certain networks then others.

Apple had this problem few years back with WiFi issues and eventually they were ironed out of the operating system. My issues seem more problematic waking from sleep then anything. Like I said in previous comments I am fine using Windows 7 mainly until this get's worked out. I considered doing a absolute clean install of Yosemite but feared affecting my BootCamp partition which right now is what I am using. If your running strictly Yosemite its probably worth a shot doing a clean install. Or going to a Apple Genius and having them use a known good image of Yosemite. Its possible the download some of us received in upgrading to Yosemite was corruptly slightly although I believe its a verified download so I question that possibility too?

I have spoken to 5 AppleCare assistants, unfortunately the problem is still not solved. Probably it isn't a hardware problem, but it is probably Yosemite. With 1 of the AppleCare assistants we did restart the iMac and went to a other partition besides Yosemite. As far as I know internet worked there like a charm.

Even with the many steps I did take with the 5 AppleCare assistants, its still not fixed. Even not with a reinstall off Yosemite.

Its a pity that a brand new iMac from 8 days old with a price tag from 1750 euro has this problem. I guess we just have to wait till Apple know how to fix this.