Github user zentol commented on the issue:

    https://github.com/apache/flink/pull/4586
  
    I configured 3 ports `9001-9003`. Each reporter logged `2017-10-25 
13:10:14,848 INFO  org.apache.flink.metrics.prometheus.PrometheusReporter       
 - Started PrometheusReporter HTTP server on port 9001.`, which should only be 
possible if they can successfully create the HttpServer.


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