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How to solve Wi-Fi issues in OS X El Capitan

Released not so long ago operating system OS X El Capitan, along with introducing innovations, was not without drawbacks. While Apple developers aim to fix flaws in the main release, users continue to look for ways to fix Wi-Fi in the new OS.

For most Mac owners experiencing difficulties with wireless networks, there is a way to solve such kind of problems. You have to reset the settings related to DNS and networks to set the MTU. Of course, this process may deter many (especially beginners) seem at first sight complicated. In fact, everything just.

Before starting work on setting up wireless connections is strongly recommended to backup data using Time Machine. Of course, if any. Otherwise, subsequent actions become a risk.

“Nullable” Wi-Fi settings

Step 1: Create on the desktop a new folder. To avoid confusion, let’s call it, for example, “wifi backup”. The owners of the Time Machine can skip this step.

Step 2: Disable all wireless networks in the upper right corner of OS X.

Step 3: Go to the Finder, located the first in the dock. Press CTRL+Shift+G and paste in the following path line:

/ Library / Preferences / SystemConfiguration /

Step 4: Press Return to navigate to that folder, and then locate and select the following files:

  • com.apple.airport.preferences.plist
  • com.apple.network.identification.plist
  • com.apple.Wi-Fi access.message-tracer.plist
  • NetworkInterfaces.plist
  • preferences.plist

Step 5: Move these files to the folder you created in the first step. However, they can just delete it if you have a Time Machine and you have stored the backup.

Step 6: Restart your Mac.

Step 7: Turn on the Wi-Fi connection and if necessary other network.

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Now it should work. If problems still exist, go to next step.

Create a new Wi-Fi network with custom DNS

Step 1: Close all open applications that use Wi-Fi, including Chrome, Safari and even Mail.

Step 2: Go to menu and select System preferences.

Step 3: Locate the submenu “Network” and select wifi in the left part of the window.

Step 4: Open the drop-down list “Location” and then “Edit layout”. Clicking on the plus sign button to create a new network under a new name and click “finish”.

Step 5: Connect to your wireless network.

Step 6: Click the Advanced button in network preferences and go to the TCP/IP tab. Click renew DHCP lease.

Step 7: Go to the DNS tab and under “DNS servers” click on the plus sign button to add a new DNS server. We recommend you to specify the following: 8.8.8.8 or 8.8.4.4.

Step 8: Click on the tab “Equipment” and in the menu “Configuration” select “Manually”.

Step 9: Change the value of the Max. packet size (MTU) on “Arbitrary” and in the box, enter the number of 1453. Click OK.

Step 10: To complete the settings, click “Apply”. On this network setting will be changed.

If all actions were performed in accordance with the instructions, you should get a perfectly working Wi-Fi. Test it by loading any web site or the test to measure download speed.

Other tips on how to troubleshoot Wi-Fi

If the Wi-Fi issues on your Mac preserved, try the following:

  • Restart your Mac in safe mode. This will remove all the accumulated cash and renew the connection.
  • Reboot the router, which is connected to the Mac.
  • Update your Wi-Fi router.
  • Connect your Mac to networks of 2.4 GHz. Possible problems with the network at 5 GHz.
  • Reset SMC.
  • In case of emergency: do a clean install of OS X El Capitan.
  • In case of emergency: make a downgrade to OS X Yosemite or Mavericks.
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