FIX: An access violation may occur when a computer that is running Host Integration Server 2006 or Host Integration Server 2004 is configured to use the IP-DLC link service to communicate with an IBM mainframe and a network outage occurs

You have a computer that is running Microsoft Host Integration Server 2006 or Host Integration Server 2004. When you configure the computer to use an IP-DLC link service to communicate with an IBM mainframe, an access violation may occur in the snaipdlc!nba_mm_free function. This problem can occur when a network outage occurs between the Host Integration Server system and the IBM mainframe.

When this problem occurs, the IP-DLC link service cannot reestablish a connection to the IBM mainframe until the SNA Server service (Snaservr.exe) is stopped and restarted.

Additionally, event messages that resemble the following event messages are logged in the Application log:

Event message 1

Event ID: 590
Source: SNA IP-DLC Link Service
Description: Failed to contact a DLUS for PU. Retry count exceeded. PU name = @C000001

Event message 2

Event ID: 624
Source: SNA Server
Description: Creating dump file E:\Host Integration Server\traces\snadump.log for snalink.exe

Event message 3

Event ID: 23
Source: SNA Server
Description: Connection Failure
Connection = ConnectionName
Link Service = SNAIP1
Outage Code = 00AE

Event message 4

Event ID: 4097
Source: DrWatson
Description: The application, , generated an application error. The error occurred on Date @ Time. The exception generated was c0000005 at address MemoryAddress (<nosymbols>)

Host Integration Server 2004

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. 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 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.

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

Host Integration Server 2006

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. 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 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.

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.

32-bit (x86) version

64-bit (x64) version

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.