"XACT_E_CONNECTION_DOWN" error on SQL Server instances after you restart MS DTC in Windows 8 or Windows server 2012

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Standard


This issue occurs on a Windows 8-based or Windows Server 2012-based SQL Server cluster. When you restart Microsoft Distributed Transaction Coordinator (MS DTC), SQL Server instances might not be able to reconnect to MS DTC successfully. Therefore, distributed transactions might fail with the error message until you restart the SQL server instances.

Note When this issue occurs, SQL Server does not log any message of losing connection.


This issue occurs because the MS DTC proxy does not notify SQL Server that the connection is lost after MS DTC restarts. Therefore, SQL Server does not release a pointer and does not reinitialize the MSDTC proxy until it restarts.


Hotfix information

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

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


There is no prerequisite to apply this hotfix.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


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


See the terminology that Microsoft uses to describe software updates.