A leak occurs in the Netbt.sys file in the following Terminal Server environments:

•	Microsoft Windows Server 2003 Service Pack 1 (SP1) Terminal Server
•	Microsoft Windows Server 2003 Terminal Server

These environments have many NetBIOS over TCP/IP (NetBT) connections. The leak in the Netbt.sys file exhausts all available TCP endpoints for outgoing traffic. This problem occurs in Terminal Server environments with thousands of log on and log off transactions per day.

Note This problem may also affect servers that do not have Terminal Server enabled.

When you use the Tdimon.exe tool on Terminal Server, you receive an error message that resembles the following:Note You must restart the computer after you receive this error.

When you run the nltest /sc_query command on Terminal Server, you receive an error message that resembles the following:When you run the netdom query fsmo command on Terminal Server, you receive an error message that resembles the following:Note x64-based versions of Windows Server 2003 include Windows Server 2003 SP1.

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Service pack information

To resolve this problem, obtain the latest service pack for Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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Hotfix information

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.

Prerequisites

To install this hotfix, you must have Windows Server 2003 Service Pack 1 (SP1) installed on your computer.

Restart requirement

You must restart your computer after you apply this 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.

Windows Server 2003, Itanium-based versions

File name	File version	File size	Date	Time	Platform
Netbt.sys	5.2.3790.2659	560,128	13-Mar-2006	14:57	IA-64

Windows Server 2003, x64-based versions

File name	File version	File size	Date	Time	Platform
Netbt.sys	5.2.3790.2659	379,392	13-Mar-2006	14:55	x64

Windows Server 2003, x86-based versions

File name	File version	File size	Date	Time	Platform
Netbt.sys	5.2.3790.2659	179,712	14-Mar-2006	02:24	x86

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Server 2003 Service Pack 2.

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For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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