This Warning event indicates that the Name Service Provider Interface (NSPI) of the Exchange server encountered a problem when communicating with a global catalog server. This problem may be a transient one. However, if this event is logged repeatedly, further investigation is needed. The 0x2746 error (mentioned in event 9040) translates to the WinSock error WSAECONNRESET. This connection reset can happen because of network related problems. This is a rare occurrence and usually a second connection attempt will succeed.

To resolve this Warning event, do one or more of the following:

• Check if a firewall or other device exists between the Exchange server and the global catalog with which it is communicating.
  
  
• Check network related factors in your environment.
  
  
• Check the cabling on the network card of the Exchange server.
  
  

If this warning event continues to occur, do one or more of the following:

• Review the Application log for related events. For example, events that occur immediately before and after this event may provide more information about the root cause of this warning.
  
  
• If you are having difficulty resolving the issue, contact Microsoft Product Support. For more information, visit the Contact Us page of the Microsoft Help and Support Web site.
  
  

For more information about global catalog servers and domain controllers, refer to Microsoft Windows documentation. 

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.