Consider the following scenario. In an application, you use the SQL Native Client data provider to connect to an instance of Microsoft SQL Server 2005. The instance of SQL Server 2005 is configured to use database mirroring. Additionally, you specify a failover partner server in the connection string of the application. In this scenario, you may receive the following error message when you connect to the principal server after failover occurs:Additionally, the following error message may be logged in the SQL Server error log:

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This problem occurs because the code in the System.Data.dll file does not correctly process state changes for the current connections in the connection pool. This behavior occurs when you specify a failover partner server in the connection string of the application.

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Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Restart information

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

Hotfix file information

This hotfix contains only those files that are required to correct the issues that this article lists. This hotfix may not contain all the files that you must have to fully update a product to the latest build.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

The .NET Framework 2.0, x86-based versions

File name	File version	File size	Date	Time	Platform
System.data.dll	2.0.50727.948	2,903,552	26-Oct-2007	03:22	x86

The .NET Framework 2.0, x64-based versions

File name	File version	File size	Date	Time	Platform
System.data.dll	2.0.50727.948	2,969,600	25-Oct-2007	22:49	x64
System.data.dll	2.0.50727.948	2,903,552	26-Oct-2007	03:22	x86

The .NET Framework 2.0, Itanium-based versions

File name	File version	File size	Date	Time	Platform
System.data.dll	2.0.50727.948	3,111,936	26-Oct-2007	00:05	IA-64
System.data.dll	2.0.50727.948	2,903,552	26-Oct-2007	03:22	x86

Note This hotfix is not included in the .NET Framework 2.0 Service Pack 1 (SP1). If you are using the .NET Framework 2.0 SP1, you must apply the following rollup package:

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

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For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

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