The following scenarios can cause Control Manager to delete managed products from the Product Directory:
Reinstalling the Control Manager server and selecting Delete existing records and create a new database option
This option creates a new database using the name of the existing one.
Replacing the corrupted Control Manager database with another database of the same name
Accidentally deleting the managed product using the Directory Manager
If a Control Manager server�s managed products records are lost, the agents on the products still "know" where they are registered to. The product agent will automatically re-register itself after 8 hours or when the TMI service is restarted. Therefore, recovering agents is a relatively easy process.
To recover managed products removed from the Product Directory:
Restart Trend Micro Control Manager service on the managed product server
Wait for the Agent to re-register itself
By default, the Control Manager agent verifies its connection to the server every eight (8) hours. If the agent detects that its record has been deleted, it will re-register itself automatically.
Refer to Change agent connection re-verification frequency to modify the agent verification time.