Hi,
The TurboTax 2018 updater is not respecting Windows proxy settings. We can see the initial update requests go to the proxy, but those requests result in 302 return codes (website temporarily moved).
Then no further requests are made through the proxy: The updater tries to go direct to subsequent URL's which get blocked by our network (since it enforces proxy use). The user then gets error 42002 (Could not connect to the update site).
This is new behavior in the 2018 product. Previous years worked fine through the proxy.
