When does the analysis fail?

KB4340742 Fix: Access to SSAS using http fails in SQL Server

Problem Description

Imagine the following scenario:

  • You have installed Microsoft SQL Server Analysis Services (SSAS) on SQL Server 2017.

  • You configure HTTP access to SSAS through the msmdpump.dll file.

In this scenario, your access to SSAS using http will fail and you will receive an error message that is similar to one of the following:

Error message: XML parsing error on line LINE_NUMBER, Column column_number: DTD is not allowed.

"File system error", while reading from the "compressed data stream" file, the following error occurred.


This fix is ​​included in the following update for SQL Server:

Cumulative update 9 for SQL Server 2017

After you install this update, please follow these steps to resolve this issue:

  1. Stop the IIS application pool

  2. Copy the new msmdpump. Dll file to the IIS web server. For information, see "Step 1: Copy the MSMDPUMP Files to a Folder on the Web Server" in the Configuring HTTP Access to Analysis Services for IIS 8.0 topic on the Microsoft Docs website.

  3. Restart the IIS application pool.

SQL Server build information

Each new build for SQL Server includes all of the hotfixes and security updates that were in the previous build. We recommend that you install the latest build for your version of SQL Server:

The latest build for SQL Server 2017


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Sources of information

Review the standard terminology Microsoft uses to describe software updates.