Test results: Unknown error (Creating a Prometheus data source)

Hi all, I am a new user of these tools (prometheus and grafana). I am following the steps described in the link: https://prometheus.io/docs/visualization/grafana/#creating-a-prometheus-data-source , but I am getting the error “Unknown error” when testing the connection. How can I get more information about the errors to identify the root cause of the fail connection?

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