Microsoft KB Archive/941091

= The SnmpMgrOpen function fails and returns a null session, and the GetLastError function returns a 0 in Windows Server 2003 =

Article ID: 941091

Article Last Modified on 10/11/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Enterprise Edition
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * 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

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SYMPTOMS
When you run a Simple Network Management Protocol (SNMP) management program on a Microsoft Windows Server 2003-based computer, the SNMP service does not return accurate information. When this problem occurs, the SnmpMgrOpen function fails and returns a null session. Additionally, the GetLastError function returns a 0 instead of a correct error code.

Therefore, the SNMP management program cannot detect functional failure, and related functions fail unexpectedly.

This problem occurs if the following conditions are true:
 * The SNMP management program is a multithread program.
 * One thread calls the SnmpMgrOpen function and the SnmpMgrClose function in a loop.
 * At the same time, another thread calls the SnmpMgrTrapListen function in a loop.

Note The problem does not occur when the same program runs in Windows Vista.



CAUSE
This problem occurs because of a synchronization issue in the Mgmtapi.dll module.



Hotfix information
A supported hotfix is now 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 Windows Server 2003 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

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

Prerequisites
To apply this hotfix, you must have Windows Server 2003 Service Pack 2 installed on the computer. 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 2, x64-based versions


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 a similar problem that occurs in Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

834115 The SnmpMgrOpen function fails and returns a null session, and the GetLastError function does not return an error code

For more information about the SnmpMgrOpen function, visit the following Microsoft Developer Network Web site:

http://msdn2.microsoft.com/en-us/library/aa378044.aspx

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

Additional query words: SnmpMgrOpen NULL GetLastError

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver kbwinserv2003postsp2fix KB941091

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