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This article describes an issue where a message on the Node Details page reads A Network Node was not selected.
The Node Status may also say Node is Unknown.
You may also get an error when trying to delete the node or change its polling method:
NPM 11.5 and later
The node has an incorrect PollingEngineID.
Note: If you want to see all the nodes where EngineID is not found based on step 1, you can run the following:
SELECT TOP 1000 * FROM [dbo].[NodesData] where EngineID != '1'
Where '1' is returned from the query in step one