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Prevent Mac OS X 10.7 and above from trying to connect to MIT's 802.1x network when using a wired connection


  • Users are presented with an 802.1x login screen when trying to acquire an IP address on MIT's wired network.
    802.1X login screen

  • A feature in Mac OS X 10.7 (Lion), OS X 10.8 (Mountain Lion), and OS X 10.9 (Mavericks) is erroneously attempting to auto-configure your Mac to use MIT's 802.1x server.
  • Connectivity is never achieved.

Mitigation Instructions

  1. Navigate to System Preferences.
    Apple > System Preferences

  2. Select Network.
    Network screen

  3. In the left-hand column, select Ethernet (Note: Those with Mac Pros may see multiple Ethernet listings).
    Network preferences screen

  4. In the lower right-hand corner of the network window, select Advanced.
    Advanced button

  5. Select the tab labeled 802.1x and toggle the check-box labeled Enable Automatic Connection so that it is not checked.

    8.02.1X tab

  6. Click OK then click Apply.
  7. Reboot your Mac for changes to take effect.

For more information on how Mac OS X Lion and Mountain Lion handle 802.1x networks, see Apple's knowledge base article.

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

March 07, 2014

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  1. May 05, 2016

    These instructions worked great. Thanks.

    I'm a little confused though because my machine has a static IP. What am I missing?

    See attached screenshot.

    Thanks. Barbara

  2. Oct 17, 2011

    I'm having problems as well with a static IP - I cannot connect at all if I disable 802.1X autoconnect; with it enabled I end up in an endless loop of choosing a certificate and it not working. Either way I can't connect to MITnet with a static wired address any longer

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