WDC Based Connections Fail When Using Proxy Configurations from PAC Files

Published: 07 Oct 2020
Last Modified Date: 15 Oct 2020


When attempting to connect Tableau Desktop to a WDC (Web Data Connection) data source a blank screen or o "Your Internet Access is blocked" message may appear. 


  • Tableau Desktop 2020.3.0 - 2020.3.1
  • Tableau Desktop 2020.2.0 - 2020.2.6
  • Tableau Desktop 2020.1.0 - 2020.1.9
  • Tableau Desktop 2019.4.0 - 2020.4.12
  • WDC based data sources


Upgrade to one of the following versions:
  • Tableau Desktop 2020.3.2
  • Tableau Desktop 2020.2.7
  • Tableau Desktop 2020.1.10
  • Tableau Desktop 2019.4.13


Tableau Desktop change from using Webkit to WebEngine did not allow access for proxy configurations from .pac files.
This is a known issue that is addressed in more recent version of Tableau Desktop.

Additional Information

The following example message will be in the Tableau Desktop logs:

web-data-connector","v":"WDC security interceptor -- non-XHR origin: '' dest: 'http://hostname/proxyfile.pac' -- denied"}
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