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

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Article ID: 982518 - View products that this article applies to.
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SYMPTOMS

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: 
Event ID: 211
Source: SNA IP-DLC Link Service
Description:
The UDP Stub encountered an error when receiving UDP data. WinSock error code: 10052

Cause:
Windows Sockets reported an error when receiving UDP data.

Effect:
The UDP Stub terminates.

Event ID: 412
Source: SNA IP-DLC Link Service
Description:
The SNAP-IPDLC UDP stub process has abended - SNAP IPDLC will abend
DLC = IPDLC000
Port = IPPORT00
Local address = TCP/IP Address SAP=4
Local UI address = TCP/IP Address SAP=4

Cause:
The UDP stub process has abended.

Effect:
SNAP-IPDLC will abend itself. All links using SNAP-IPDLC will fail. SNAP-IPDLC will fail.

Event ID: 77
Source: SNA IP-DLC Link Service
Description:
DLC failed
DLC name = IPDLC000


Cause:
A DLC has ended abnormally.

Effect:
All ports and link stations defined on the DLC will be inoperative.

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.

CAUSE

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.

RESOLUTION

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:
http://support.microsoft.com/contactus/?ws=support
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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatformSP requirement
Snaipdlc.dll8.0.3757.21,003,34423-Apr-201020:11x86SP1
Trcipdlc.dll8.0.3757.23,023,69623-Apr-201020:11x86SP1
Host Integration Server 2009, 64-bit editions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatformSP requirement
Snaipdlc.dll8.0.3757.21,397,07223-Apr-201020:14x64SP1
Trcipdlc.dll8.0.3757.23,782,99223-Apr-201020:14x64SP1
Note Because of file dependencies, the most recent fix that contains these files may also contain additional files.

STATUS

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

MORE INFORMATION

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:
recvfrom function

Properties

Article ID: 982518 - Last Review: June 18, 2010 - Revision: 3.0
APPLIES TO
  • Microsoft Host Integration Server 2006 Enterprise Edition
  • Microsoft Host Integration Server 2006
  • Microsoft Host Integration Server 2009
  • Microsoft Host Integration Server 2004 Enterprise Edition
  • Microsoft Host Integration Server 2004 Service Pack 1
  • Microsoft Host Integration Server 2004 Standard Edition
  • Microsoft Host Integration Server 2006 Service Pack 1
Keywords: 
kbhotfixserver kbfix kbautohotfix kbexpertiseadvanced kbsurveynew kbqfe KB982518

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