AirPort - Unable to connect after sleep/restart

Version 1
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.)