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Event ID: 21078 Source: MicrosoftOperationsManager

Computer Discovery Engine failed to contact machine "<name>". This could be a misspelled computer name or the computer is not contactable.

Error Message: "Machine name: <name> [IP: <IP address>] Error: Workstation info failed with Status code : <error code> Error Message: <error message>."
- Error code: 53, error message: "The network path was not found" - In my case, the computer was really turned off.
- Error code: 5, error message: "Access is denied" - I caught this error when I attempted to deploy an agent remotely without the appropriate rights to do this.

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