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Open ports 7199, 7000, 7001, and 9042

Cassandra needs 7199 for JMX (nodetool), 7000 for gossip, 7001 for gossip over SSL, and 9042 for native binary (client connections). You shouldn't need Thrift (port 9160), so don't open the port or enable the protocol unless you have a reason to.

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