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Microsoft .NET FileSystemWatcher reports System.IO.InternalBufferOverflowException

Last Updated:

Applies to

  • Applications using SMB notification to track changes
  • Applications using FileSystemWatcher Class Microsoft .NET Framework FileSystemWatcher Class of Win32 ReadDirectoryChangesW API (example: Seclore)
  • Clustered Data ONTAP - the 'changenotify' property enabled on a watched share


  • The applications using Change Notify to track changes in the CIFS shares such as adding/deleting/renaming a file to a directory, are not receiving all notifications about changes that happened
  • The applications using the FileSystemWatcher class reports the following error:
    • System.IO.InternalBufferOverflowException: Too many changes at once in directory <path>
  • The applications using the Win32 ReadDirectoryChangesW API might not work as expected.


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