Error "The Certificate Issuer for this site is untrusted or unknown" When Activating Tableau Server

Published: 17 Mar 2015
Last Modified Date: 12 Jan 2017


When activating Tableau Server or Tableau Desktop, the activation might fail with the following error message:
The Certificate Issuer for this site is untrusted or unknown. Do you wish to proceed?


  • Tableau Server
  • Tableau Desktop


Option 1

Modify your firewall rules to allow traffic for the following domains: 

Option 2

Use offline activation. For more information, see Activation.


A conflict is preventing the download of the Certificate Trust List (CTL) and Certificate Authority (CA) certificates. Because of this, Windows is unable to verify that the SSL certificate from is valid and trusted. 
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