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.)
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