Knowledge Base

FIX: An application that is included in SQL Server 2005 may stop responding when you specify a network protocol that is not valid in the application

Article ID: 941184

Article Last Modified on 8/30/2007

APPLIES TO

Microsoft SQL Server 2005 Standard Edition
Microsoft SQL Server 2005 Developer Edition
Microsoft SQL Server 2005 Enterprise Edition
Microsoft SQL Server 2005 Enterprise X64 Edition
Microsoft SQL Server 2005 Enterprise Edition for Itanium-based Systems
Microsoft SQL Server 2005 Standard X64 Edition
Microsoft SQL Server 2005 Standard Edition for Itanium-based Systems
Microsoft SQL Server 2005 Workgroup Edition

Bug #: 50001598 (SQL Hotfix)

Microsoft distributes Microsoft SQL Server 2005 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2005 fix release.

SYMPTOMS

Consider the following scenario. You use an application that is included in Microsoft SQL Server 2005. In the application, you specify a network protocol that is not valid. In this scenario, the application may stop responding.

For example, you may experience this issue when you use the sqlcmd command prompt utility.

Additionally, if you examine the file that is generated by the Dr. Watson for Windows tool, you may find the following information:

SQLNCLI.DLL!XxMpHeapFree
SQLNCLI.DLL!CImpISOSHost_MPMemObj::Free
SQLNCLI.DLL!SNIOpenSyncEx
SQLNCLI.DLL!CTdsParser::SNIOpenConnection
SQLNCLI.DLL!CTdsParser::GetConnection
SQLNCLI.DLL!CTdsParser::DoConnect
SQLNCLI.DLL!CTdsParser::OpenServerConnection
SQLNCLI.DLL!CDBConnection::Connect
SQLNCLI.DLL!CDataSource::ConnectIt
SQLNCLI.DLL!CImpIDBInitialize::Initialize

CAUSE

This issue occurs because a heap corruption occurs when the application connects to SQL Server.

The application uses SQL Native Client (SQLNCLI) to connect to SQL Server. When you specify a network protocol that is not valid in the application, SQL Native Client ignores the error that is returned from the SQL Server networking interface (SNI). Therefore, the heap corruption occurs.

RESOLUTION

The fix for this issue was first released in Cumulative Update 3. For more information about how to obtain this cumulative update package for SQL Server 2005 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

939537 Cumulative update package 3 for SQL Server 2005 Service Pack 2

Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2005 fix release. Microsoft recommends that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

937137 The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 2 was released

Microsoft SQL Server 2005 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2005 Service Pack 2 hotfix to an installation of SQL Server 2005 Service Pack 2. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.

STATUS

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

MORE INFORMATION

For more information about what files are changed, and for information about any prerequisites to apply the cumulative update package that contains the hotfix that is described in this Microsoft Knowledge Base article, click the following article number to view the article in the Microsoft Knowledge Base:

939537 Cumulative update package 3 for SQL Server 2005 Service Pack 2

REFERENCES

For more information about the list of builds that are available after SQL Server Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

937137 The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 2 was released

For more information about the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:

935897 An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problems

For more information about how to obtain SQL Server 2005 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

913089 How to obtain the latest service pack for SQL Server 2005

For more information about the new features and the improvements in SQL Server 2005 Service Pack 2, visit the following Microsoft Web site:

http://go.microsoft.com/fwlink/?LinkId=71711

For more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:

822499 New naming schema for Microsoft SQL Server software update packages

For more information about software update terminology, 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

Keywords: kbsql2005connect kbhotfixrollup kbfix kbpubtypekc kbqfe kbexpertiseadvanced kbhotfixserver KB941184

Microsoft KB Archive/941184

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