Components, which monitor file system need permissions to access them. Try to validate, if the user used to monitor the node has access to the directory has read permissions to the monitored directory. It usually is, but doesn't have to be. If the directory permissions are OK, than try to have a look at "CIM_DataFile" class (namespace) permissions in WMI. This probe uses WMI to read the data remotely, so it needs acces to the classes. To test this scenario, try to run following query from WbemTest too, from powershell or another WMI tool: "SELECT FileSize FROM CIM_DataFile WHERE Path LIKE 'FullPathToMonitoredDirectory'" (replace the FullPathToMonitoredDirectory with required path in your system).
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