Only two clients can create a TCP connection after you install SQL Server 2000 SP2 or SP3

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Article ID: 815295 - View products that this article applies to.
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Symptoms

After you install Microsoft SQL Server 2000 Service Pack 2 (SP2) or SQL Server 2000 Service Pack 3 (SP3) on a Microsoft Windows 2000 Server-based computer that has the Routing and Remote Access service installed and running as a network address translation (NAT) server, only two internal clients can create a TCP connection through the NAT server to an outside server.

Cause

This problem occurs when you install either SQL Server 2000 SP2 or SQL Server 2000 SP3. During the installation of either service pack, the installer sets the following registry key to the value 1433-1434:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ReservedPorts
The Windows 2000 NAT driver then reads this key and limits the outgoing NAT TCP/UDP source port mappings to this range. Because the default setting for this registry key is for two ports, only two internal clients can create a TCP connection through the NAT server to an outside server.

After you apply the hotfix that is described in the "Resolution" section, the NAT driver uses the following registry key range value to limit outgoing NAT TCP/UDP source port mappings:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPNAT\parameters\ReservedPorts

Resolution

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.

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, submit a request to 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:
http://support.microsoft.com/contactus/?ws=support
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

No prerequisites are required.

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 tool in Control Panel.
   Date         Time   Version        Size    File name
   ----------------------------------------------------
   03-Jul-2003  20:26  5.0.2195.6768  67,120  Ipnat.sys

Status

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

More information

For additional information about how to use the ReservedPorts registry key, click the following article number to view the article in the Microsoft Knowledge Base:
812873 How to reserve a range of ephemeral ports on a computer that is running Windows Server 2003 or Windows 2000 Server
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 815295 - Last Review: October 26, 2013 - Revision: 5.0
Applies to
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Advanced Server
Keywords: 
kbnosurvey kbarchive kbautohotfix kbhotfixserver kbqfe kbbug kbfix kbwin2000presp5fix KB815295

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