Key monitoring and management tasks for DirSync include analyzing logs for errors, and remediating sync errors with the tool itself. Typical issues that can lead to problems including:
Installation errors, such as using incorrect onpremises or Office365 credentials.
Inadvertently deactivating DirSync in the portal or through PowerShell.
Unexpected changes in ActiveDirectory that affect OU scoping or attribute filtering.
Corrupted ActiveDirectory, requiring directory recovery.