This Error event indicates that Availability service could not find the security descriptor for the local server that is running Microsoft Exchange that logged this event. A security descriptor is used to control access to a server object. For more information about security descriptors, see Security Descriptors and Access Control Lists Technical Reference. 

This event may occur when one or more of the following conditions are true:

• The local Exchange server that logged this event was not successfully registered with Active Directory or the Domain Name System (DNS) server.
  
  
• The Exchange server that logged this event is trying to connect to a domain controller that is not working correctly.
  
  

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

• Make sure that the Exchange server that logged this event is registered correctly on the DNS server. For more information about how to troubleshoot DNS issues, see DNS Troubleshooting.
  
  
• Run the Dcdiag command line tool to test domain controller health. To do this, run dcdiag /s:<Domain Controller Name> at a command prompt on Exchange Server. Use the output of Dcdiag to discover the root cause of any failures or warnings that it reports. For more information, see Dcdiag Overview.
  
  
• Review related Error and Warning events in the Application log. These related events may help you find the root cause of this error.
  
  

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.