Q: Losing network or internet connection after sleep/wake

In my experience, the only way to make the spinning beach ball of dead go away in those cases is erasing the hard drive and doing a clean install of the new OS.

You can also try repairing permissions and verifying the disk, but if there is some incompatible items left behind by software you installed at some point, a clean install is the safest solution.

Thank you! After weeks of frustration you've saved me a call to the Mac specialist and probably hundreds of $. I thought I was going crazy when my Mac was the only thing in the house not connecting to the internet.

The only software I have downloaded that did not come with the computer is Adobe Reader.  I have reset PRAM and so far, so good, (I don't even know what resetting PRAM means!  I just followed the directions I found online.)   If the symptom recurs, I will follow your suggestions.  Thanks.

Well, Yosemite disconnects wifi, too!  Just not as much as Mavericks, thankfully.  So now I will move on to the Yosemite wifi disconnect discussion, knowing full well that NOTHING I do is going to make a lasting difference until APPLE figures out what it is doing wrong.

Reforger,

Thanks. What a relief! All I did was disconnect my AC chords to my modem router and Mac in anticipation of a flood where I live. Thank God for no flood. However, for some reason the symptoms you described happened after I reconnected everything.. I would renew the DHCP. I would manually change the address. It became a huge pain everytime I booted up. I tried your solution and then booted up. Everything works GREAT!  No need to be put on hold with my service provider. LOL. Thanks again!

Thank you very much for this response, worked first time.

F my life. I've got this problem, too, with my Mac Mini and Yosemite. Trying various remedies, I tried turning off Bluetooth.

"Hey, why do I have Bluetooth turned on, anyway?"

"Oh yeah, I have a new wireless mouse and keyboard. I guess I should turn Bluetooth back on. I just click right here."

"Hey, why is my mouse unresponsive? Oh...."

Of course, there is no corded mouse in the office, and it's the middle of a business day.

I realize it may be too late now but it could be useful next time.

You can force a shutdown with the power button, turn on the machine again and if not mouse is connected, the Blue-tooth assistant will come up asking you to turn your mouse on/make it discoverable.

Worked for me too.  However, I wonder if it would not be adequate to simply change the service order int he Automatic location and accomplish the same thing.

Thanks a lot Reforger, it worked great!

I was really getting tired of switching WiFi on/off every time my MacBook woke up.

Best way I found, which by the way seems to have also made my Macbook Pro Internet faster, is to go to network settings / advanced / DNS

from here add 2 new DNS servers to the list, and delete any other that may be in the list, if you can't delete all of them don't worry about it, they will just simply get replaced, add:

8.8.8.8

8.8.4.4

These are google servers and are free, they are know for having good speeds and better security over the default that you router uses.

P.S.

The periods ARE important, after you add these servers the internet will not drop any more and will seem a bit more responsive as well!!!!

The speed up could be related to the DNS servers assigned by your ISP being slower or overloaded but it should not affect you LAN or WiFi working in any way.

I have to said that after dealing with this problem for a long time (Reforger's work around made it better but it didn't completely fixed) since I updated to 10.10.4 the problem seems to be gone, all related to the removal of discoveryd apparently.

"the problem seems to be gone, all related to the removal of discoveryd apparently"

I was (and sometimes still am) experiencing this problem on OS X Mavericks, which does not have discoveryd but mDNSResponder, so discoveryd is probably not the only faulty component.

Yes, I definitely had the same problem on Mavericks, and then for the first three versions of Yosemite as well.

Just now it seem to have gone away for good in 10.10.4

I've been following this thread for months, tried many of the suggested solutions. Chances are, there are several separate issues going on, with similar symptoms, but different causes and solutions. The miracle solutions posted so far on this thread have been generally disappointing.

In my case, I'm on a new Mac Mini. Today, I upgraded to 10.10.4. We'll see if that contains fixes.

Specifically, there is one web page I often use throughout the day. It's usually open in my browser. If  I don't use the machine for awhile (how long? Not sure... 30 to 60 minutes, maybe?) the page won't refresh and I have to wait for it for a long time, maybe two or three minutes, possibly longer. At these times, other internet connectivity is also lost. I'm not sure if the onset of the problem coincides with the screen going to sleep.( I'm usually busy and distracted when not facing the screen.) I'm guessing it does.

The problem began when I got my new Mac Mini. At the same time, I got a new bluetooth keyboard and mouse, and also a new Time Capsule. I now use the Time Capsule's WiFi, instead of the WiFi in the modem I get from AT&T. There were several hypotheses to test. Connecting by ethernet instead of WiFi didn't help. That ruled out the possibility that the WiFi on the router was timing out. I tried removing the Time Capsule. That didn't help. Same problem with the old modem/router. I'm planning to get a wired keyboard, to see if Bluetooth is part of the problem, haven't gotten around to it, yet.

I made one change that instantly and permanently eliminated the problem. Not very original, I admit. System Preferences --> Energy Saver -->

"Prevent computer from sleeping automatically when display is off." Enabled

"Enable power nap" Enabled

"Put hard disk to sleep when possible" Disabled.

The problem has disappeared.

I'd rather have the computer and hard disk sleep when possible. I will turn these things on one at a time, and try to narrow it down a bit more. Will also try the wired keyboard. Will report back.