You need to configure NiFi settings after you start NiFi successfully.
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Go to .
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Select NiFi.
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Click NiFi Web UI.
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Log in to NiFi.
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On the NiFi UI, click Controller Settings.
The NiFi Settings screen appears.
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Go to the Registry Clients tab.
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Recheck or configure NiFi Registry URL on the NiFi UI to point to the correct
hostname and port number.
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Go to the Reporting Tasks tab.
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Remove the AmbariReportingTask setting.