Article ID: 891860 - View products that this article applies to.
If you configure one or more connection agreements between a computer that is running Microsoft Exchange Server 2003 Service Pack 1 (SP1) and Active Directory directory services, the following symptoms occur:
This problem occurs because the Microsoft Active Directory Connector (MSADC) component cannot use the Lightweight Directory Access Protocol (LDAP) version 3 protocol to communicate with Active Directory after it tries to use the LDAP version 2 protocol.
By default, the MSADC uses LDAP version 3 to communicate with Active Directory. For backward compatibility reasons, MSADC may try to use an earlier version of LDAP if it experiences problems during the communication session.
However, earlier versions of LDAP do not support some critical LDAP extensions that are required by MSADC. The event message that is mentioned in the "Symptoms" section is logged in the application log when MSADC tries to use those extensions when it communicates by using LDAP version 2.
When you restart the MSADC service, the MSADC component uses LDAP version 3 to communicate with Active Directory.
Service pack informationTo resolve this problem, obtain the latest service pack for Exchange Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/836993/ )How to obtain the latest service packs for Exchange Server 2003
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:
PrerequisitesNo prerequisites are required.
Restart requirementYou do not have to restart your computer after you apply this software update.
Hotfix replacement informationThis hotfix does not replace any other software updates.
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 tool in Control Panel.
Date Time Version Size File name ---------------------------------------------------- 11-Feb-2005 04:58 6.5.7232.80 697,344 Adc.exe
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 Exchange Server 2003 Service Pack 2.
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
824684For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
(http://support.microsoft.com/kb/817903/ )New naming schema for Exchange Server software update packages
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