General troubleshooting steps

Ensure firewalls are properly opened between the opscenterd machine and each node.

Check the following files (on any of the nodes having problems) for any errors:

/var/log/cassandra/system.log
/var/log/datastax-agent/agent.log

Verify that Cassandra (or DSE) was not previously installed on any of the machines; if it was, all binaries, configuration files, logs, etc. must be cleared out first.

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