Consider the following scenario:

•	You have a computer that is running Microsoft Host Integration Server 2006.
•	This computer uses the IP-DLC link service to communicate with an IBM mainframe.

In this scenario, you may experience an access violation in the snaipdlc!nba_use_prereserved_buffer function. When this problem occurs, the IP-DLC link service closes unexpectedly. Therefore, all connected users lose their existing host sessions if the host sessions were established over host connections or over peer connections through the IP-DLC link service.

This problem is most likely to occur under the following circumstances:

•	The Host Integration Server configuration includes several thousand dependent LUs that are defined on host connections by using the IP-DLC link service.
•	The Host Integration Server systems have been running for a long time since they were last restarted.

Note The issue may also occur on Host Integration Server 2004 and Host Integration Server 2004 Service Pack 1 (SP1) systems.

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Host Integration Server 2006

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Host Integration Server 2006 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

To apply this hotfix, you must be running Host Integration Server 2006.

Restart requirement

You must restart the Host Integration Server computer after you install 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.

Host Integration Server, 32-bit (x86)

File name	File version	File size	Date	Time	Platform
Snaipdlc.dll	7.0.2888.0	992,768	10-Apr-2008	20:20	x86
Trcipdlc.dll	7.0.2888.0	2,961,920	10-Apr-2008	20:20	x86

Host Integration Server, 64-bit (x64)

File name	File version	File size	Date	Time	Platform
Snaipdlc.dll	7.0.2888.0	1,463,808	10-Apr-2008	20:21	x64
Trcipdlc.dll	7.0.2888.0	3,953,664	10-Apr-2008	20:22	x64

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

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Host Integration Server 2004

A hotfix is currently not available for Host Integration Server 2004.

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

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