|Message:||Process %1 (PID=%2). Topology discovery failed, error 0x%3 (%4). Look up the Lightweight Directory Access Protocol (LDAP) error code specified in the event description. To do this, use Microsoft Knowledge Base article 218185, “Microsoft LDAP Error Codes.” Use the information in that article to learn more about the cause and resolution to this error. Use the Ping or PathPing command-line tools to test network connectivity to local domain controllers.|
This Error event indicates that new topology could not be generated. If this is not the first topology discovery since system startup, the previously discovered topology will be used. If it is the first topology discovery, most of the Exchange services will not start.
Topology discovery failure is usually a sign of connectivity or permission problems and must be investigated immediately. The following are the possible causes:
To resolve this error, do one or more of the following:
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.