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Hadoop cluster not listening on port that I configured. What is wrong?

I set up a Hadoop cluster with RHEL 7.4 servers. There is no firewall between them. I am running Hadoop 3.0. On the namenode the core-site.xml file is configured to use port 54310. I run this ...
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The command "hdfs dfsadmin -report" fails because "failed to connect to server"

I am trying to configure a multi-node cluster of open source Hadoop. I have Hadoop 3.0 installed on the namenode and the data node. Both are running Linux (SUSE and Ubuntu). None are CentOS, RedHat ...
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