Error "Communication with the Tableau Protocol Server process was lost" When using Teradata ODBC Driver
Published: 19 Jan 2019
Last Modified Date: 17 Apr 2019
IssueWhen creating or refreshing an extract based on a Teradata connection, the following error occurs in Tableau Desktop and Tableau Server:
ExternalProtocol::PipeMessageSource::ReadBytes: Communication with the Tableau Protocol Server process was lost.
In addition, Tableau Desktop will display a prompt to reconnect.
- Teradata 16.20.0.x driver
- Tableau Desktop or Server installed on a machine using comma as decimal separator (Most European locales, including German, French, Spanish...)
- High precision columns (Decimal (16,#) or higher)
ResolutionTry one of the following workarounds:
Important: Tableau does not test or support TDC files. These files should be used as a tool to explore or occasionally address issues with your data connection. Creating and maintaining TDC files requires careful manual editing, and there is no support for sharing these files.
- Use the attached TDC file.
- This TDC will tell the Teradata driver to ignore the machine regional setting.
- Please note that is the extract is published, a matching TDC file will need to be in Tableau Desktop and Tableau Server repository and the extract will need to be republished using the TDC file.
This issue only affects Teradata ODBC drivers 16.20.X. Uninstalling 16.20.X and installing any of the previous version (15.00.X, 15.10.X, 16.10.X) will resolve the issue.
- Creating a DSN for Teradata. In the DSN configuration, uncheck the box for Use Regional Settings for Decimal Symbol.
- To connect using a DSN, please select the Generic ODBC connector in Tableau Desktop instead of the Teradata connector.
Change the regional settings on the machine running Tableau Desktop or Tableau Server to use a dot as decimal separator.
In Teradata, change the data type of the column to NUMBER(16,4) instead of DECIMAL(16,4)
- This behaviour is related to a known issue with Teradata drivers 16.20.
- The issue occurs when Tableau is installed on a machine using comma as decimal separator and queries a field that has a datatype Decimal (16,#) or higher in Teradata.
- Teradata is aware of the issue and are working of a fix for a future version, contact Teradata's Support team for more information.