AD replication is not working with event 1865 logged

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Article ID: 944351 - View products that this article applies to.
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Source: Microsoft Support

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Result



You have multiple sites in the forest. On some sites, you find that AD replication is not working.

On the Inter-Site Topology Generator (ISTG) Domain Controllers, the following events are logged every 15 minutes.

Event Type: Warning
Event Source: NTDS KCC
Event Category: Knowledge Consistency Checker
Event ID: 1865
Date: <date>
Time: <time>
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: <computername>
Description:
The Knowledge Consistency Checker (KCC) was unable to form a complete spanning tree network topology. As a result, the following list of sites cannot be reached from the local site.

Sites:
CN=<sitename>,CN=Sites,CN=Configuration,DC=<domain>,DC=com



Event Type: Error
Event Source: NTDS KCC
Event Category: Knowledge Consistency Checker
Event ID: 1311
Date: <date>
Time: <time>
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: <computername>
Description:
The Knowledge Consistency Checker (KCC) has detected problems with the following directory partition.

Directory partition:
CN=Configuration,DC=<domain>,DC=com

Cause



This may happen when there are connectivity issues between the ISTG servers. For example, if a firewall has blocked the ports, the issue would occur.

Resolution



Use the portqry tool to troubleshoot the connectivity issues to the Bridgehead servers of the sites that are listed in Event 1865. If the ports are blocked by the firewall, configure the firewall to open the ports.

MoreInformation



For more information, please refer to the following Knowledge Base articles:

179442 How to configure a firewall for domains and trusts
http://support.microsoft.com/default.aspx?scid=kb;EN-US;179442

816103 HOW TO: Use Portqry to Troubleshoot Active Directory Connectivity Issues
http://support.microsoft.com/default.aspx?scid=kb;EN-US;816103

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Article ID: 944351 - Last Review: October 29, 2007 - Revision: 1.1
APPLIES TO
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
Keywords: 
kbnomt kbrapidpub KB944351

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