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Why is my MacBook giving me a self-assigned ip address on my community college's wifi?

289 Views 2 Replies Latest reply: Sep 10, 2012 12:11 PM by TheFuzzyWuzzy RSS
TheFuzzyWuzzy Calculating status...
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Sep 4, 2012 8:31 AM

My iPod works fine on the wifi, and people around me are connecting fine. But my MacBook is telling me that "Wi-Fi has the self-assigned ip address 169.254.122.65 and will not be able to connect to the internet". Anyone have this problem and find a solution? It only happens on the community college wifi, so I can't exactly reboot the router...

MacBook Pro, OS X Mountain Lion (10.8)
  • macsay Calculating status...

    I just experienced the exact same problem today, but after some trial & error, found the problem among the network preference files.

     

    Many unexplained process problems can arise from corrupted preferences files, that get damaged for unknown reasons. The easiest solution is to remove the corresponding preferences from the Library files (in this case, the Network preferences). After a quick restart, the system rebuilds them in the same folder.

     

    • From Finder click Shift+Command+C, to open device folder (or Go To Apple Menu Bar > Go > Computer)
    • Go To: Macintosh HD > Library > Preferences > SystemConfiguration
    • Within the SystemConfiguration Folder Locate the following 3 documents:
      1. com.apple.airport.preferences.plist
      2. com.apple.network.identification.plist
      3. NeworkInterfaces.plist
    • Select all three docs (while holding the Shift key)
    • Move the 3 docs to the trash to sit (don't delete yet... just in case).
    • Now Restart the computer.
    • The Network should have registered the IP so Network Preferences confirms a Status: Connected, followed by the message, "Wi-Fi is connected to (router) and has the IP address xx.x.x.x".
    • If not, ensure the the Turn Wi-Fi On button is clicked.
    MacBook Pro, SOLUTION TO: Self-Assigned IP

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