The article you link above is basically saying that the issue is happening because the proxy is timing out before the request can complete. We're not really able to add more instruction on how to configure the proxy, because we don't know what proxy you might have installed, but someone at your organization should be able to help reconfigure it for you. The solution has helped dozens of people who are encountering this same problem, so it is definitely worth a try. Does that help, or was there something specific about the article that wasn't quite working for you? I work on Tableau's knowledge base and am definitely interested in knowing how we could make these articles better.