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"Unknown external service error code" When Connecting to TabPy Server


Published: 28 Jul 2021
Last Modified Date: 29 Jul 2021

Issue

When testing the connection details for a TabPy server in the External Service Connection dialog in Tableau Desktop, the following error may occur:

Unknown external service error code 27

or

Unknown external service error code 26

Environment

  • Tableau Desktop 2019.4 and older
  • TabPy Server
  • SSL

Resolution

When configuring a connection to a TabPy Server that is using SSL encryption, select the Require SSL option., and click the Custom configuration file... link to specify a certificate for the connection.

Cause

For secure connections on HTTPS using SSL with TabPy Server, older Tableau versions require a certificate to be specified in Tableau. 
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