Applications or services that use LDAP API functions stop responding under a heavy workload in Windows Server 2003

Consider the following scenario:

• You run a multithreaded application or service on a computer that is running Windows Server 2003.
• The application or service uses the Lightweight Directory Access Protocol (LDAP) API functions.

In this scenario, the application or service stops responding. Additionally, you have to restart the application or service to recover from this issue.

This issue occurs because of a deadlock situation in the Win32 LDAP API module (Wldap32.dll).

To resolve this issue, install the following hotfix on the affected computer that is running Windows Server 2003.

Hotfix information

Mainstream support for this product ended on July 13, 2010. A hotfix for this issue exists but is not publicly available. Please review the�Microsoft Support Lifecycle policy.

Extended Support

The Extended Support phase follows Mainstream Support for Business and Developer products.
At the supported service pack level, Extended Support includes:

• Paid support
• Security update support at no additional cost
• Non-security related hotfix support requires a separate Extended Hotfix Support Agreement to be purchased (per-fix fees also apply)

Please note:

• Microsoft will not accept requests for warranty support, design changes, or new features during the Extended Support phase
• Extended Support is not available for Consumer, Hardware, or Multimedia products

Please contact Microsoft Support for information on how to obtain the hotfix.

Prerequisites

To apply this hotfix, you must be running Windows Server 2003 Service Pack 2 (SP2).

For more information about how to obtain a Windows Server 2003 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

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 English 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 Server 2003 file information notes

• In addition to the files that are listed in these tables, this hotfix also installs an associated security catalog file (KBnumber.cat) that is signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2003

For all supported x64-based versions of Windows Server 2003

For all supported IA-64-based versions of Windows Server 2003

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

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