Microsoft KB Archive/891860

= Event ID 8146 is logged in the application log every five minutes after the Exchange 2003 SP1 MSADC component experiences LDAP communication problems =

Article ID: 891860

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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SYMPTOMS
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:  The Active Directory Connector (ADC) may stop processing the Recipient Connection Agreement.  An event that is similar to the following is logged in the application log every five minutes:

Event Type: Error

Event Source: MSADC

Event Category: Replication

Event ID: 8146

Date: 9/3/2004

Time: 11:57:51 AM

User: N/A

Computer:

Description:

An operation on server  returned [0xc] Unavailable Critical Extension. has stopped. 



CAUSE
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 &quot;Symptoms&quot; 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 information
To 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:

836993 How to obtain the latest service packs for Exchange Server 2003

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 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
No prerequisites are required.

Restart requirement
You do not have to restart your computer after you apply this software update.

Hotfix replacement information
This hotfix does not replace any other software updates.

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 tool in Control Panel.   Date         Time   Version       Size     File name 11-Feb-2005 04:58  6.5.7232.80   697,344  Adc.exe



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Exchange Server 2003 Service Pack 2.



MORE INFORMATION
For additional information, 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

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

817903 New naming schema for Exchange Server software update packages

Additional query words: MSADC

Keywords: kbqfe kbhotfixserver kbfix kbbug kbexchange2003presp1fix KB891860

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