Open Software Solutions

When a Windows Vista-based computer is used as a file server, users access files by using long-term Server Message Block (SMB) requests. By default, only 10 SMB requests can be sent to the server at the same time. All other SMB requests are not answered. Therefore, the user of a client computer may receive an error message when the user tries to access files by using long-term SMB requests.

Note Unlike typical SMB requests, a long-term SMB request remains open until it is answered by the server. A typical long-term SMB request is the NotifyChange SMB request (NT_TRANSACT_NOTIFY_CHANGE).

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Most SMB requests are processed immediately. However, long-term SMB requests may cause a problem.

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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:

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:

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

Registry information

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 the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To enable this hotfix, follow these steps:

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.

Windows Vista, 32-bit versions

Windows Vista, 64-bit versions

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By default, the MaxCmds entry is set to 50 in Windows Vista. You cannot set this value to more than 65,535.

On a Windows Vista-based server, the MaxMpxCt entry, the MaxWorkItems entry, and the Size entry are located in the following registry subkey:

On a Windows Vista-based client computer, the MaxCmds entry is located in the following registry subkey:

You must set the following registry entries on the server.

Note When this article mentions the SMB protocol, the article refers to the traditional SMB protocol instead of to the SMB2 protocol. The SMB2 protocol was introduced in Windows Vista to enable faster communication between Windows Vista-based computers.

For more information about this problem in Microsoft Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:

For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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