KB4569837 - FIX: Intermittent connection error occurs when an expression is used for both connection string and password of a connection manager

Applies To
SQL Server 2016 Developer - duplicate (do not use) SQL Server 2016 Enterprise - duplicate (do not use) SQL Server 2016 Enterprise Core - duplicate (do not use) SQL Server 2016 Standard - duplicate (do not use) SQL Server 2019 on Windows SQL Server 2017 on Windows

Symptoms

Assume that you have a Microsoft SQL Server Integration Services (SSIS) package that has multiple parallel tasks internally, and each of these tasks shares a same connection manager. When an expression is used for both connection string and password of the connection manager, you notice that an intermittent connection error that resembles the following description occurs:

DateTime Logon       Login failed for user 'XXXX'. Reason: Password did not match that for the login provided. [CLIENT: <local machine>]

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Resolution

This problem is fixed in the following cumulative updates for SQL Server:

About cumulative updates for SQL Server:

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:

References

Learn about the terminology that Microsoft uses to describe software updates.