Article ID: 940480 - View products that this article applies to.
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You are running a 32-bit application on a computer that is running a 64-bit version of Windows Vista. The application uses the NetBIOS API to communicate over the network. In this Windows on Windows 64 (WOW64) environment, the 32-bit application can open a connection, and it can send data. However, the application cannot use the NetBIOS API to receive data.
For example, the 32-bit application successfully makes an NCBSEND command call. However, the NCBRECVANY command cannot receive data correctly.
Note This problem does not occur in the following scenarios:
This problem occurs because of an error in the NetBIOS interface driver (NetBIOS.sys). When the NetBIOS interface driver is receiving data, the driver sometimes does not convert the network connection block (NCB) structure from the 64-bit version to the 32-bit version. Therefore, the 32-bit application cannot understand the NCB structure.
Service pack informationTo resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/935791/ )How to obtain the latest Windows Vista service pack
Hotfix informationA 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. 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 Web site:
http://support.microsoft.com/contactus/?ws=supportNote 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.
PrerequisitesNo prerequisites are required.
Restart requirementYou have to restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any other previously released hotfixes.
Registry informationTo use one of the hotfixes in this package, you do not have to make any changes to the registry.
File informationThe 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 item in Control Panel.
Windows Vista, 64-bit versions
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.
Windows on Windows 64 (WOW64) is a compatibility environment that enables 32-bit Windows-based applications to run on 64-bit Windows-based operating systems.
For more information about the same problem in Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:
940074For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/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
(http://support.microsoft.com/kb/824684/LN/ )Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 940480 - Last Review: January 16, 2015 - Revision: 4.0