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Consider the following scenario:

In this scenario, the Host Integration Server may log the following event message when it tries to start the APPC or CPI-C application:


This problem occurs when the APPC or CPI-C application receives data from the calling transaction program. And, the data is segmented so that the first byte of the Application Data General Data Stream (GDS) variable is included at the end of the previous block of data that is received from the IBM host system. In this case, the APPC DLL (Wappc32.dll) does not correctly parse the received data when an Application Data GDS variable is split across two message segments in this manner. The APPC protocol violation error is returned to the calling transaction program on the IBM host when this problem occurs.


Cumulative update information

The fix that resolves this issue is included in cumulative update package 1 for Host Integration Server 2013. For more information about how to obtain the cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:

2908834 Cumulative Update Package 1 for Host Integration Server 2013The fix that resolves this problem is included in Cumulative Update 9 for Host Integration Server 2010.


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


The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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