In Microsoft BizTalk Server, you enable the compression feature for Applicability Statement 2 (AS2) messages.
Note To enable the compression feature, check the Compress Message option on the Party as AS2 Message Receiver page of the AS2 Properties dialog box.
You receive an AS2 message from your trade partner through the AS2EdiReceive pipeline.
In this scenario, a Message Disposition Notification (MDN) is sent from you to your trade partner. However, your trade partner does not receive the MDN. Instead, the trade partner receives an error message that resembles the following:
Description: MIC not verified # MIC values not verified: <MIC Value>
Note The MDN is an acknowledgement message that is sent in response to an AS2 message. If the compression feature is enabled, the AS2 transmission cannot complete until the MDN is received and is verified.
This problem occurs because the Message Integrity Check (MIC) values are calculated incorrectly when the compression feature is enabled. Therefore, the MDN is rejected.
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 Web site:
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.
You must have BizTalk Server 2006 R2 and the BizTalk EDI/AS2 Runtime installed to apply this hotfix.
You do not have to restart the computer after you apply this hotfix. However, you must restart the BizTalk Server services after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
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.
To work around this problem, disable the compression feature by unchecking the Compress Message option on the Party as AS2 Message Receiver page of the AS2 Properties dialog box.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.