Microsoft KB Archive/841394

= You may not be able to connect to an instance of SQL Server that is configured to use the TCP/IP server network library on a computer that is running Windows XP Service Pack 2 =

Article ID: 841394

Article Last Modified on 12/1/2005

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APPLIES TO


 * Microsoft SQL Server 2000 Standard Edition, when used with:
 * Microsoft Windows XP Service Pack 2
 * Microsoft SQL Server 2000 Desktop Engine (Windows), when used with:
 * Microsoft Windows XP Service Pack 2
 * Microsoft SQL Server 7.0 Standard Edition, when used with:
 * Microsoft Windows XP Service Pack 2
 * Microsoft SQL Server 2005 Developer Edition, when used with:
 * Microsoft Windows XP Service Pack 2
 * Microsoft SQL Server 2005 Enterprise Edition, when used with:
 * Microsoft Windows XP Service Pack 2
 * Microsoft SQL Server 2005 Express Edition, when used with:
 * Microsoft Windows XP Service Pack 2
 * Microsoft SQL Server 2005 Standard Edition, when used with:
 * Microsoft Windows XP Service Pack 2
 * Microsoft SQL Server 2005 Workgroup Edition, when used with:
 * Microsoft Windows XP Service Pack 2

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SYMPTOMS
You may not be able to connect to an instance of Microsoft SQL Server 7.0, to an instance of Microsoft SQL Server 2000, to an instance of Microsoft SQL Server 2000 Desktop Engine (also known as MSDE 2000), to an instance of Microsoft SQL Server 2005, or to an instance of Microsoft SQL Server 2005 Express Edition, and you may receive one of the following error messages.

Error message 1

[TCP/IP Sockets]Specified SQL server not found.

[TCP/IP Sockets]ConnectionOpen (Connect).

Error message 2

Unable to connect to server :

Server : Msg 6, Level 16, State 1

[Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]Specified SQL server not found.

This behavior occurs when all the following conditions are true:
 * You try to connect to an instance of SQL Server or to an instance of MSDE 2000 that is installed on a computer that is running Microsoft Windows XP Service Pack 2 (SP2).
 * You try to connect to an instance of SQL Server that is configured to listen on the TCP/IP server network library only.



CAUSE
By default, Windows Firewall is turned on when you install Microsoft Windows XP Service Pack 2. Because Windows Firewall blocks the TCP/IP ports that allow network connections to an instance of SQL Server or to an instance of MSDE 2000, you may not be able to connect to an instance of SQL Server when SQL Server is configured to listen on the TCP/IP server network library only.



WORKAROUND
To work around this problem, you must explicitly enable TCP/IP connectivity for SQL Server.

For additional information about how to enable SQL Server connectivity over TCP/IP manually, click the following article numbers to view the articles in the Microsoft Knowledge Base:

841252 How to manually enable TCP/IP on Windows XP Service Pack 2 for SQL Server 2000

841823 How to manually enable TCP/IP for SQL Server 7.0 on a computer that is running Windows XP Service Pack 2

For additional information about how to enable SQL Server connectivity over TCP/IP programmatically, click the following article number to view the article in the Microsoft Knowledge Base:

839980 How to use a script to programmatically open ports for SQL Server to use on systems that are running Windows XP Service Pack 2

841251 How to enable SQL Server connectivity on Windows XP Service Pack 2



STATUS
This behavior is by design.

