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Consider the following scenario:

  • You install Microsoft BizTalk Accelerator for HL7 (BTAHL7) on a computer that is running Microsoft BizTalk Server 2009 or Microsoft BizTalk Server 2010.

  • You create a receive location that uses Minimal Lower Layer Protocol (MLLP) adapter to receive messages.

In this scenario, the following events might be logged in the Application log even though the incoming messages are processed correctly.

Event 1

Event 2

Event 3

Note If you are using BizTalk Server 2010, the Event Source is "BizTalk Server 2010."


This issue occurs because the message sender that establishes a connection with BizTalk Server 2009 sends a blank message.


For BizTalk Server 2009

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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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: 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.


To apply this hotfix, you must have BizTalk 2009 Accelerator for HL7 (BTAHL7) installed. Additionally, you must have the following hotfixes installed before you apply this hotfix:

970492 FIX: A BizTalk host instance consumes lots of memory and processes messages very slowly when BizTalk Server 2009 receives lots of HL7 messages

973909 FIX: Event IDs 5812, 5743, and 5754 are logged when you use BizTalk 2009 Accelerator for HL7 (BTAHL7)

981442 FIX: Error message "Unable to write data to the transport connection" when you use BizTalk 2009 Accelerator for HL7 in BizTalk Server 2009

Restart requirement

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

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

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.

For all supported versions of BizTalk Server 2009

File name

File version

File size









For BizTalk Server 2010

The fix that resolves this issue in BizTalk Server 2010 is described in KB 2564013. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

2564013 FIX: A hotfix is available that provides additional Delivery Mode properties for the Minimal Lower Layer Protocol send and receive adapters in BizTalk Accelerator for HL7 in a BizTalk Server 2010 environment


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


For more information about BTAHL7 Help, visit the following Microsoft Developer Network (MSDN) website:

General information about BTAHL7 Help

For more information about BizTalk Server hotfixes, click the following article number to view the article in the Microsoft Knowledge Base:

2003907 Information on BizTalk Server hotfixes

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