Make sure you have the latest software updates available for your version of Mac OS. Click the Apple menu in the upper left hand corner of the desktop and choose About This Mac:
If you need to update, connected to a wired network and click the Software Update button to download the latest version of OS X for your computer.
You must be on-campus and in range of a UVM wireless access point to follow these steps.
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Note that it may take up to fifteen seconds to establish full network connectivity after clicking "OK".