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NiFi API on remote host SocketException

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When I run NiFI 1.8 on my local machine (http://localhost:8080/nifi) I am able to interact with the application through the API using Java. I can start and stop processors, and I get a 200 response code everytime.

When I use the same code to interact with a remote NiFI instance (which uses authentication) I get a SocketException, with the message "Unexpected end of file from server"

I tried setting credentials of the HttpURLConnection but it made no difference. Is this an issue with a certificate? If it is I'm not sure how to obtain and set the correct one.

Any clues?

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