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Could not connect to the update site (Error 42015: The proxy name could not be resolved: 'http') occurs when attempting to update TurboTax.
This error occurs if the specified proxy server is invalid or TurboTax is unable to connect using the proxy server.
If you're still having update problems, or cannot connect to the Internet after making the above change, repeat these steps, except this time check the box in Step 3. Then download a manual update.