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Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
After you install Microsoft BizTalk Server 2004 Service Pack 1 (SP1), message processing may slow or stop when the maximum number of concurrent FTP connections is exceeded.
This problem may occur when you are using dynamic send ports and when the OutboundTransportLocation property changes from message to message.
BizTalk Server 2004 SP1 introduced FTP adapter throttling. FTP adapter throttling improves the response time of the FTP adapter and minimizes the use of system resources when you use the FTP adapter. This problem occurs because FTP adapter throttling causes remote FTP server connections to remain open on the remote FTP server.
FTP adapter throttling is enabled when you create or set the FtpMaxConcurrentConnections registry entry. The FtpMaxConcurentConnections registry entry controls the number of FTP connections for every FTP send port in a BizTalk process. As soon as a connection to the remote FTP server is successfully established, the connection will remain connected until the send port is stopped or until the remote FTP server forcefully disconnects. This new behavior causes remote FTP server connections to remain open on the remote FTP server and to consume resources.
For more information about BizTalk Server 2004 SP1, visit the following Microsoft Web site:
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.
To apply this hotfix, you must have BizTalk Server 2004 SP1 installed on the computer.
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
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 tool in Control Panel.
Date Time Version Size File name -------------------------------------------------------------------------- 22-Apr-2005 20:57 3.0.6120.0 122,880 Microsoft.biztalk.coreadapter.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
For this hotfix to fix the issue addressed in the Symptoms section, you must add the new FTPReuseConnection registry entry after you apply this hotfix. The FTPReuseConnection registry entry closes the FTP client connection when the FTP adapter has completed the send.
Setting this registry entry can cause a decrease in performance because the change causes the FTP send adapter to open the connection and to close the connection for every message that is sent. This registry entry should only be used when the destination URL frequently changes.
To add this registry entry, follow these steps:
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey: