Error "Tableau Data Engine Error: 406: Unable to connect to the file" Connecting to Excel

Published: 29 Sep 2016
Last Modified Date: 12 Jun 2017


When connecting to an Excel data source, the following error occurs:
Tableau Data Engine Error: 406:Unable to connect to the file. Check that the file exists and that you have sufficient access privileges for it.


  • Tableau Desktop 10.0.0
  • Windows 10
  • Excel


  • Open Tableau Desktop as Administrator (right click on Tableau icon and select "Run as administrator") and attempt to connect again to the Excel file. 
  • Work with your IT team to ensure that your user account has administrator rights or security permissions to the AppData folder.  
  • Work with your IT team to whitelist the temporary files folder in your anti-virus or firewall. 


Either the user account does not have the necessary permissions to access the file, or antivirus is interfering with the connection. 
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