Microsoft KB Archive/922131

= You cannot remotely connect to a named instance of SQL Server 2000 by using the TCP/IP protocol =

Article ID: 922131

Article Last Modified on 7/18/2006

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APPLIES TO


 * Microsoft SQL Server 2000 Standard Edition
 * Microsoft SQL Server 2000 Enterprise Edition
 * Microsoft SQL Server 2000 Developer Edition
 * Microsoft SQL Server 2000 Workgroup Edition

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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



SYMPTOMS
Consider the following scenario. You have a computer that is running an instance of Microsoft SQL Server 2005 and a named instance of Microsoft SQL Server 2000. After you uninstall the instance of SQL Server 2005, you cannot remotely connect to the named instance of SQL Server 2000 by using the TCP/IP protocol.



CAUSE
This problem occurs because the SQL Server 2000 listener service no longer listens on UDP port 1434 after you uninstall the instance of SQL Server 2005.



WORKAROUND
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.

To work around this problem, follow these steps:  Click Start, click Run, type regedit, and then click OK. In Registry Editor, locate the following registry entry:

 Delete the IsListenerActive registry entry. Alternatively, you can double-click the IsListenerActive registry entry, type No in the Value data box, and then click OK. Close Registry Editor.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

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MORE INFORMATION
SQL Server Resolution Protocol (SSRP) was developed so that SQL Server 2000 would listen on UDP port 1434 for incoming requests for the named instance of SQL Server 2000. SQL Server 2005 introduces the SQL Server Browser service. This service replaces SSRP.

When you have a named instance of SQL Server 2000 that is running side-by-side with an instance of SQL Server 2005 on the same computer, the SQL Server Browser service listens on UDP port 1434 for incoming requests for the named instance of SQL Server 2000. However, after you uninstall SQL Server 2005, the IsListenerActive registry entry is not deleted. Therefore, SSRP does not listen on UDP port 1434.

Keywords: kbexpertiseadvanced kbtshoot kbprb KB922131

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