To enable MediaHint on Boxee:

Step 1: Open Settings > General > Location. Make sure that “hide feeds and applications that cannot be played in your location” is unchecked (if you don’t have this checkbox, then skip this step)

Step 2: Open Settings > Network

Step 3: Select Manually under the Configure menu

Step 4: Change DNS server only to:
Primary DNS: 198.58.98.50
Secondary DNS: 23.92.29.210

Step 5: Click Save and Apply network changes

Step 6: Restart your Boxee Box

Note: Boxee Box only works with the US and Canadian version of certain apps due to a hardware limitation of the Boxee Box.
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