FIX: The IP-DLC link service closes all connections to an IBM mainframe when a WSAENETRESET error is returned to one connection

Consider the following scenario:

• You use Microsoft Host Integration Server 2009 to communicate with an IBM mainframe that uses the IP-DLC link service.
• One of the connections tries to receive UDP packets.
• The connection receives a TCP/IP socket error 10052 (WSAENETRESET).

In this scenario, the IP-DLC link service�unexpectedly closes all the connections. Then, the IP-DLC link service tries to reestablish the connections to the IBM mainframe. However, the�tries�fail�if the WSAENETRESET error continues to occur. Additionally, error messages that resemble following may be logged in the Application log:�
Note The error messages may be logged every 25 seconds�if the underlying WSAENETRESET error is returned when the IP-DLC link service tries to reestablish the IP-DLC connections.

This issue occurs because the IP-DLC link service closes all active IP-DLC connections when any connection receives a WSAENETRESET error. This operation is performed even though the other connections are not affected by the error.

Microsoft Host Integration Server 2009

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 2009 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

There are no prerequisites to install this hotfix.

Restart requirement

You do not have to restart the computer after you apply the 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 2009, 32-bit editions

Host Integration Server 2009, 64-bit editions

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.

After you apply the hotfix, the IP-DLC link service will only close the connection that received the WSAENETRESET error. All other IP-DLC connections will remain active and available. The IP-DLC link service uses the recvfrom function to receive UDP packets. The WSAENETRESET error is returned on an outstanding recvfrom call that is issued by the IP-DLC link service. For datagram sockets such as UDP, the WSAENETRESET error indicates that the Time to Live (TTL) is expired. The WSAENETRESET error occurs due to network issues that cause a UDP packet to loop through the network until the TTL expires. For more information about the recvfrom function, visit the following Microsoft Developer Network website: