Error "Tableau Prep Stopped Running Because an Underlying Process Stopped Unexpectedly" When Starting Tableau Prep

Published: 01 Aug 2018
Last Modified Date: 04 Jan 2019


When starting Tableau Prep, the following error might occur after installing it in an environment where a proxy server is used: 

Tableau Prep stopped running because an underlying process stopped unexpectedly. If this problem continues, try reinstalling the product.


Tableau Prep 2018.2.1


Ensure that localhost ( is added to the exception list in your computer's proxy settings. To do so, follow the steps below with the help of your IT team: 
  1. In Internet Explorer, navigate to the Tools menu (cog icon), and select Internet Options.
  2. On the Connections tab, click LAN Settings.
  3. If a proxy server is enabled, check the box marked Bypass proxy server for local addresses
  4. If Automatically detect settings or Use automatic configuration script is enabled, work with your local IT team to bypass addresses in the local proxy by clicking Advanced and manually add in Exceptions field.


Tableau Prep sends a HTTP request to the Application Layer when it is launched. This HTTP request can be caught by a proxy when localhost has not been added as an exception. 
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