Can'；无法连接到Cassandra（尝试查询的所有主机均失败

我正在尝试设置Datastax OpsCenter

当我尝试运行datastax代理时，出现以下错误：

Can't connect to Cassandra (All host(s) tried for query failed (tried:
/X.X.X.X1:9042 (com.datastax.driver.core.exceptions.TransportException:
[/X.X.X.X1:9042] Cannot connect), /X.X.X.X2:9042 
(com.datastax.driver.core.exceptions.TransportException: 
[/X.X.X.X2:9042] Cannot connect), /X.X.X.X3:9042 
(com.datastax.driver.core.exceptions.TransportException: 
[/X.X.X.X3:9042] Cannot connect), /X.X.X.X4:9042, /X.X.X.X5:9042, 
/X.X.X.X6:9042 [only showing errors of first 3 hosts, use getErrors() 
for more details])), retrying soon.

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如果需要任何其他详细信息，请告诉我。

在/opscenter\u agent/log/agent.log中发现上述错误，可能与重复