This Error event indicates that some or all of the transport agents that are configured on this Microsoft Exchange Server 2010 server have not started. As a result, the Microsoft Exchange Transport service has been forced to stop. This Error event can only occur when the Microsoft Exchange Transport service is starting. The transport agent or transport agents that caused the error are included in Event 1052, which accompanies this Error event. The following are two of the reasons why these Error events occur:

• The transport agent is not installed or configured correctly.
  
  
• The Active Directory directory service is not available.
  
  

To resolve this error, follow one or more of these steps:

• Examine Event 1052 to determine which transport agent has caused the error.
  
  
• Check the transport agent documentation, and verify its configuration.
  
  
• Uninstall, and then reinstall the transport agent.
  
  
• If you can't determine the cause of the failure, you can disable the transport agent to prevent it from loading when the Microsoft Exchange Transport service starts. Disabling the transport agent lets you start the Microsoft Exchange Transport service and restart mail flow. Be aware that if you disable a transport agent, the actions that the transport agent performed will not be applied to messages that pass through the affected server until the transport agent is re-enabled. To disable a transport agent, use the following command:
  
  

  	Copy Code
  Disable-TransportAgent <Name of transport agent>

• Contact the third-party vendor who supports the respective transport agent if the transport agent is not created by Microsoft.
  
  
• Resolve your issue by using self-support options, assisted support options, and other resources. You can access these resources from the Exchange Server Solutions Center. From this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base, posting a question at the Exchange Server forums, and others. Alternatively, in the navigation pane, you can click Assisted Support Options to contact a Microsoft support professional. Because your organization may have a specific procedure for directly contacting Microsoft Technical Support, be sure to review your organization's guidelines first.
  
  

For more information about disabling transport agents, see Disable-TransportAgent.

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.