32-bit NetBIOS applications cannot receive connection close notifications in a 64-bit version of Windows 7 or in Windows Server 2008 R2

Article translations Article translations
Article ID: 2633667 - View products that this article applies to.
Expand all | Collapse all

On This Page

Symptoms

Consider the following scenario:
  • You run a 32-bit application on a computer that is running a 64-bit version of Windows 7 or Windows Server 2008 R2.
  • The application uses the network basic input/output system (NetBIOS) API to communicate with a remote computer.
  • The NetBIOS session is ended or closed while the application is receiving data.
In this scenario, the application does not receive notifications that the session has ended or closed and does not try to reestablish the session. You have to restart the application to recover from this issue.

Notes
  • You do not experience this issue when you run the 32-bit application on a computer that is running a 32-bit version of Windows 7.
  • You do not experience this issue if you recompile the application as a 64-bit application and then run it on a computer that is running a 64-bit version of Windows 7 or Windows Server 2008 R2.

Cause

This issue occurs because of an error in the NetBIOS interface (Netbios.sys) driver. When the Netbios.sys driver is receiving data, the driver does not convert the network connection block (NCB) structure from 64-bit to 32-bit when the session is abandoned. Because the 32-bit application cannot understand the 64-bit NCB structure, the issue described in the Symptoms section occurs.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. 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 website:
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

To apply this hotfix, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.1.760 0 . 16xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 0 . 21xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1 . 21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Netbios.sys6.1.7600.2109744,54424-Nov-201105:25x64
Wshnetbs.dll6.1.7600.1638513,31214-Jul-200901:41x64
Netbios.sys6.1.7601.2186644,54424-Nov-201105:23x64
Wshnetbs.dll6.1.7600.1638513,31214-Jul-200901:41x64
For all supported IA-64–based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Netbios.sys6.1.7600.21097136,70424-Nov-201104:27IA-64
Wshnetbs.dll6.1.7600.1638531,74414-Jul-200901:50IA-64
Netbios.sys6.1.7601.21866136,70424-Nov-201104:17IA-64
Wshnetbs.dll6.1.7600.1638531,74414-Jul-200901:50IA-64

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 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
For more information about a similar issue, click the following article number to view the article in the Microsoft Knowledge Base:
940480 A 32-bit application cannot use the NetBIOS API to receive data on a computer that is running a 64-bit version of Windows Vista
For more information about a similar issue, click the following article number to view the article in the Microsoft Knowledge Base:
940074 A 32-bit application cannot use the NetBIOS API to receive data on a computer that is running a 64-bit version of Windows Server 2003

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_043049066698287fbad551d86c88953b_31bf3856ad364e35_6.1.7601.21866_none_999550a3836af6c5.manifest
File versionNot applicable
File size699
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable
File nameAmd64_132816a25ba2731aac0fe6be2e007125_31bf3856ad364e35_6.1.7600.21097_none_d4090e1eedfb8742.manifest
File versionNot applicable
File size699
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable
File nameAmd64_microsoft-windows-netbios_31bf3856ad364e35_6.1.7600.21097_none_b65758e49df468d5.manifest
File versionNot applicable
File size4,308
Date (UTC)24-Nov-2011
Time (UTC)18:50
PlatformNot applicable
File nameAmd64_microsoft-windows-netbios_31bf3856ad364e35_6.1.7601.21866_none_b85d4f289b03317c.manifest
File versionNot applicable
File size4,308
Date (UTC)24-Nov-2011
Time (UTC)18:50
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size3,215
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable
Additional files for all supported IA-64–based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_1ba857e66fbf801e529f25449ede14db_31bf3856ad364e35_6.1.7600.21097_none_1d85e242f192115e.manifest
File versionNot applicable
File size697
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable
File nameIa64_d1db4266ead8013a875955f90f79714e_31bf3856ad364e35_6.1.7601.21866_none_96fe9e46bd670cb2.manifest
File versionNot applicable
File size697
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable
File nameIa64_microsoft-windows-netbios_31bf3856ad364e35_6.1.7600.21097_none_5a3a6156e595009b.manifest
File versionNot applicable
File size4,307
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable
File nameIa64_microsoft-windows-netbios_31bf3856ad364e35_6.1.7601.21866_none_5c40579ae2a3c942.manifest
File versionNot applicable
File size4,307
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,947
Date (UTC)24-Nov-2011
Time (UTC)16:50
PlatformNot applicable

Properties

Article ID: 2633667 - Last Review: January 4, 2013 - Revision: 2.0
Applies to
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 for Itanium-Based Systems
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter KB2633667

Give Feedback

 

Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com