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A Common Programming Interface for Communications (CPI-C) application that worked in a Microsoft SNA Server 4.0 environment may not work in a Microsoft Host Integration Server 2006 environment. This problem may occur when the application uses another programming interface such as the Request Unit Interface (RUI) or the Session Level Interface (SLI) in addition to the CPI-C interface. In this scenario, a message that is intended for the CPI-C interface may be discarded by the RUI or SLI interface. You may notice that the Accept_Conversation call in the CMACCP function never finishes, even if the call is allocated.


Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that 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.


You must have Microsoft Host Integration Server 2006 Service Pack 1 (SP1) installed to apply this hotfix.

For more information about how to obtain the service pack, click the following article number to view the article in the Microsoft Knowledge Base:

979497 How to obtain the latest Host Integration Server 2006 service pack

Restart information

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

Replacement information

This hotfix does not replace a previously released hotfix.

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.

Microsoft Host Integration Server 2006, 32-bit Edition

File name

File version

File size










Microsoft Host Integration Server 2006, 64-bit Edition

File name

File version

File size










Note Because of file dependencies, the most recent fix that contains these files may also contain additional files.


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

More Information

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

Accept_ConversationFor more information about CPI-C, visit the following MSDN website:

CPIC: CPI-C TP Sample for Asynchronous CPI-C Calls

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