This March 2017 Preview of the Quality Rollup for Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 Service Pack 1 (SP1) includes cumulative reliability improvements in the .NET Framework 3.5.1. We recommend that you apply this rollup as part of your regular maintenance routines. Before you install this update, see the "Prerequisites" and "Restart requirement" sections.
Quality and reliability improvements
Exceptions may be thrown in SqlClient during prelogin handshake processing or during MARS communication when a received TDS packet's size is smaller than expected. Prelogin handshake errors will occur as an OverflowException, and MARS errors will occur as a generic "Physical connection is not usable" SqlException.
How to get this update
For Windows 7 SP1 and Windows Server 2008 R2 SP1
This update is available by manual download only.
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
To apply this update, you must have the .NET Framework 3.5.1 installed.
You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.
This article applies to the following:
Microsoft .NET Framework 3.5.1 when used with:
Windows Server 2008 R2 Service Pack 1
Windows 7 Service Pack 1