Microsoft KB Archive/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 =

Article ID: 940074

Article Last Modified on 10/11/2007

-

APPLIES TO


 * Microsoft Windows Server 2003, Standard x64 Edition
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, Datacenter x64 Edition
 * Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
 * Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems

-



SYMPTOMS
On a computer that is running a 64-bit version of Windows Server 2003, you run a 32-bit application that uses the NetBIOS API to communicate over the network. The application can open a connection and send data. However, the application cannot use the NetBIOS API to receive data.

Note This problem does not occur when you run the application in a 32-bit version of Windows Server 2003. This problem also does not occur when you compile the same code to a 64-bit application, and run the 64-bit application in a 64-bit version of Windows Server 2003.



CAUSE
This problem occurs because of an error in the NetBIOS interface driver (NetBIOS.sys). When the NetBIOS interface driver receives data, the driver sometimes does not convert the network connection block (NCB) structure from a 64-bit version to a 32-bit version. Therefore, the 32-bit application cannot understand the NCB structure.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
To apply this hotfix, you must have Windows Server 2003 Service Pack 1 or Windows Server 2003 Service Pack 2 installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

889100 How to obtain the latest service pack for Windows Server 2003

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The 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 Server 2003 with Service Pack 1, Itanium-based versions


WORKAROUND
To work around this problem, compile the application code to a 64-bit application.



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



MORE INFORMATION
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: NetBIOS 32-bit 64-bit receive WoW64 NCBRECV NCBSEND

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver kbwinserv2003postsp2fix KB940074

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.