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I have a MacBook Pro 15" with retina display that I use for work/personal stuff and I always shut down with Wifi having been on. When I startup my Mac the Wifi icon looks like it's searching and never actually connects (most of the time). To get it to connect I have to turn of Wifi (on my MacBook, not the router) and turn it back on, then it connects pretty much right away. What's the issue here? It's very annoying.

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For as long as I can remember, I've had to do this on my MacBook Pro Retina 15″ — I've always presumed it's the router, as I only have the problem at home. I even have a script that will automatically cycle the Wi-Fi if it's attempting to connect to my home network and fails for more than 3 seconds :) –  George Garside Jan 26 at 20:00
    
I have this problem at work and home. It started happening after the Mavericks update so I don't think it's the router. –  Christopher Perry Jan 26 at 20:44
    
I agree with @grgarside. I'm not sure if it's a Mac issue or a BSD issue, since Linux boxes also have an issue with it, but WiFi devices (internal/usb) seem to have issues with connectivity. Older OSes required restarting the machine to resume connectivity (not just restarting the WiFi software, like you can do with Mac). –  Newtons Revenge Jan 26 at 21:17
    
@GeorgeGarside Hey how can I get that script? My macbook has the exact same ANNOYING problem. Thanks. –  feed_me_code Jun 24 at 3:41

3 Answers 3

What actually helped was to reset the SMC and reset the PRAM. Now the Mac connects instantly to the WiFi.

Later edit: It looks like the problem is caused by interference from Bluetooth signals and your WiFi device. Because it connected much faster with Bluetooth off. I changed to a 5Ghz network on another WiFi AP and I had no problems since.

The following are all suggestions I've tried from different sources:

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Can you add steps for resetting the SMC and PRAM? –  Christopher Perry Jun 24 at 22:08
    
Added, thank you Christopher. –  endre Jun 26 at 6:52

http://osxdaily.com/2012/11/30/resolving-stubborn-wi-fi-connection-problems-in-mac-os-x/

Try removing some of the plist files as indicated in the above

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More elaborated answers are expected here, not just a single URL which could get offline and thus, making your answer useless. Consider editing the answer, adding some of the most relevant information from the URL you posted, and, perhaps, explaining why this could solve the issue the OP has. –  Thecafremo Jan 27 at 9:54
up vote 0 down vote accepted

Old preferences hanging around after upgrade can cause issues. To force a rebuild of the preferences open Terminal and do:

cd /Library/Preferences/SystemConfiguration
sudo rm NetworkInterfaces.plist
sudo rm com.apple.airport.preferences.plist
sudo rm preferences.plist

then restart your machine.

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