Failed Accessing Windows Event Log

SCOM reports a Warning: "Failed Accessing Windows Event Log...". and in the State Change Events description you can find:

"The Windows Event Log Provider was unable to open the nworksEventLog event log on computer 'node_xxx' for reading. The provider will retry opening the log every 30 seconds. Most recent error details: The specified channel could not be found. Check channel configuration. One or more workflows were affected by this. Workflow name: many Instance name: many Instance ID: many Management group: ClusterName "

This can happen if one or a few objects have been discovered impropelry: i.e. became managed not by the Agent, but by the RMS. In particular, this issue may result from VMguest to Agent relationship created incorrectly (please, refer to KB 1600 for more detail).

To fix this issue you can try rebuilding topology from nworks UI -> "Enterprise Manager" tab -> select "Enterprise Manager" node in the left pane -> Rebuild Full Topology.

If this does not help, contact Veeam Support for further troubleshooting.
 

You might be asked to rename certain VMs and run "Remove-DisabledMonitoringObject" PowerShell command based on the results of research.