Error "Unknown Server Error" Accessing Workbooks Connected to Published Data Sources

Published: 30 Mar 2016
Last Modified Date: 20 Dec 2017


When accessing a workbook for the second time, after it initially loads, the following error might occur:

Unknown Server Error
An unexpected error occurred. If you continue to receive this error please contact your Tableau Server Administrator.


Additionally, the following error appears in the logs:

throw DataSourceException (type=Unknown): LayeredProtocol::LayeredProtocol: Missing attribute\nUnable to connect to the file \"....". Check that the file exists and that you have sufficient access privileges for it.\n"}​


  • Tableau Server 9.3.0
  • Published Data Sources


Option 1:

Upgrade to Tableau Server 9.3.1 or a newer version. For more information, see Upgrading Tableau Server.

Option 2:

As a workaround, try one of the following: 
  • Republish the affected data source with a new name and point workbooks to the new data source name. 
  • If it is not practical to change the data source name due to the number of connected workbooks, download a local copy of the published data source, delete the published version, and then republish the local data source with the original data source name. 


This behavior is related to a known issue which has been corrected in more recent versions.
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