PaoloBlack

Q: Frustratingly, since I upgraded to Yosemite 10.10, I too am having the worst problems with WiFi dropping out. I've never had this problem before on my iMac 27-inch mid 2011 model. Turning WiFi off and then back on again sometimes works. Help please.

Frustratingly, since I upgraded to Yosemite 10.10, I too am having the worst problems with WiFi dropping out. I've never had this problem before on my iMac 27-inch mid 2011 model. Turning WiFi off and then back on again sometimes works. Help please. I've already tried a lot of your suggested fixes, but without success. Why hasn't Apple Fixed this?

iMac, OS X Mountain Lion (10.8.1), OS X Yosemite 10.10

Posted on Nov 2, 2014 2:22 PM

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Q: Frustratingly, since I upgraded to Yosemite 10.10, I too am having the worst problems with WiFi dropping out. I've never had this ... more

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  • Helpful answers

  • by Linc Davis,

    Linc Davis Linc Davis Nov 2, 2014 4:07 PM in response to PaoloBlack
    Level 10 (208,037 points)
    Applications
    Nov 2, 2014 4:07 PM in response to PaoloBlack

    Please test after taking each of the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.

    Step 1

    Take the applicable steps in this support article. The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.

    Step 2

    Disconnect all USB 3 devices. If you don't know which are USB 3, disconnect all USB devices except keyboard and mouse.

    Step 3

    If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. If you find that Wi-Fi works better with Bluetooth disabled, you should use the 5 GHz Wi-Fi band. Your router may not support it; in that case, you need a new router.

    Step 4

    Open the Energy Saver pane in System Preferences and unlock the settings, if necessary. Select the Power Adapter  tab, if there is one. Uncheck the box marked

              Wake for Wi-Fi network access

    if it's checked.

    Step 5

    Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.

    Step 6

    In the Wi-Fi settings, select

              Advanced... TCP/IP Configure IPv6: Link-local

    Click OK and then Apply.

    Step 7

    Reset the System Management Controller.

    Step 8

    Reset the PRAM.

    Step 9

    Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.

    Step 10

    Make a "Genius" appointment at an Apple Store, or go to another authorized service center.

  • by Old Toad,

    Old Toad Old Toad Nov 2, 2014 4:28 PM in response to PaoloBlack
    Level 10 (141,664 points)
    Mac OS X
    Nov 2, 2014 4:28 PM in response to PaoloBlack

    If following Linc's directions doesn't help your situation you might look at this web article: Fix Wi-Fi Problems in OS X Yosemite.

    OTsig.png

  • by nsteblay,

    nsteblay nsteblay Nov 16, 2014 3:47 AM in response to PaoloBlack
    Level 1 (15 points)
    Nov 16, 2014 3:47 AM in response to PaoloBlack

    There are definite bugs in Yosemite that need to be addressed by Apple. Multiple people are experiencing Wifi issues with fresh installs of Yosemite.

     

    I was experiencing consistent Wifi issues after a fresh install of Yosemite.  I validated that it wasn't my computer or router by doing a fresh re-install of Mavericks.  Wifi works flawlessly under Mavericks but always fails under Yosemite. No other software was installed as part of this test.

     

    Here is my configuration:

     

    Model Name: MacBook Pro

      Model Identifier: MacBookPro8,1

      Processor Name: Intel Core i5

      Processor Speed: 2.4 GHz

      Number of Processors: 1

      Total Number of Cores: 2

      L2 Cache (per Core): 256 KB

      L3 Cache: 3 MB

      Memory: 10 GB

      Boot ROM Version: MBP81.0047.B27

      SMC Version (system): 1.68f99

      Serial Number (system): C2QGV006DVHJ

      Hardware UUID: XXXXX

      Sudden Motion Sensor:

      State: Enabled