Microsoft KB Archive/923058

= FIX: Rapid Transport Protocol (RTP) connections may not be reset correctly when IP-DLC connections are restarted on Host Integration Server 2004 systems =

Article ID: 923058

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Host Integration Server 2004 Enterprise Edition
 * Microsoft Host Integration Server 2004 Standard Edition

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SYMPTOMS
Rapid Transport Protocol (RTP) connections may not be reset correctly when IP-DLC connections are restarted on Microsoft Host Integration Server 2004 systems.



CAUSE
This problem occurs because an IP-DLC connection may reconnect to an IBM mainframe by using the same Transport Connection Identifier (TCID) value that a previous IP-DLC connection used. The IP-DLC link service is designed to increment the TCID value from a starting value of 0. This behavior may result in duplicate TCID values being included in the RTP header for different IP-DLC connections.

These duplicate TCID values may also make it difficult to distinguish RTP packets in network traces when you are examining multiple IP-DLC connections.



Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

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 hotfix 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 &quot;Applies to&quot; section.



MORE INFORMATION
After you apply the hotfix, the IP-DLC link service randomly generates the TCID value. This behavior prevents duplicate TCID values in RTP connections.

