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AirPort - Unable to connect after sleep/restart

Level 8 Level 8 (47,545 points)
VERSION 1  Published
Last Modified:  Apr 21, 2012 11:08 AM


If you find that your Mac is having trouble reconnecting to an AirPort base station by wireless after either it has been sleeping or after a restart, please try the following, in order, until (hopefully) resolved:


1a. Delete Preferred Network(s)


  • System Preferences > Network > AirPort > Advanced > AirPort tab
  • Under "Preferred Networks," delete the network(s) you regularly use from the list.



1b. Delete AirPort Keychain Entries


  • Launch the "Keychain Access" application located in Applications/Utilties.
  • Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.



1c. Add Preferred Network(s)


  • System Preferences > Network > AirPort > Advanced > AirPort tab
  • Add the preferred network(s) using the "+" button.
  • Restart or log out then back in.



2. Move System Configuration Files

(Note: You will have to reestablish your network connections settings.)


  • Go to [Macintosh HD]/Library/Preferences
  • Move the SystemConfiguration folder to the desktop.
  • Restart your Mac. (Note: OS X will rebuild the files that are now sitting on your desktop. If this doesn't resolve the issue, you can move the folder back to it's original location.)

Apple does not necessarily endorse any suggestions, solutions, or third-party software products that may be mentioned in this User Tip. Apple encourages you to first seek a solution at Apple Support. Any links in this user tip are provided as is, with no guarantee of the effectiveness or reliability of the information. Apple does not guarantee that these links will be maintained or functional at any given time. Use this user tip at your own discretion.
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