Unable to Sign in to Tableau Server from Tableau Prep Builder

Published: 16 Feb 2021
Last Modified Date: 08 Jul 2022


Unable to sign in successfully to Tableau Server from Tableau Prep Builder - no error message is displayed.

Additionally, changing the site role of the same user to one with access to fewer projects may enable the user to sign in successfully.


  • Tableau Server 2020.2
  • Tableau Prep Builder


Option 1

Upgrade to Tableau Server 2020.3 or newer.

Option 2

  1. In the Tableau Prep Builder logs, check in preprestapi.log for a line entry that contains Bad Request
  2. The list of projects names and descriptions that precede the Bad Request message may end with (or partway through) a name or description. This project name or description would contain a special character that causes the error.
  3. In Tableau Server, locate the project with the name or description containing the special character, remove this character, and save the change.


One of the project names or descriptions contains a special character which results in an invalid XML response.
This behavior is related to Issue ID 1077191, which has been resolved in Tableau Server 2020.3 and newer.
Did this article resolve the issue?