nodetool and importcsv issue in cluster env

In cluster env,

1. The import-csv.sh command output:

./import-csv.sh -h x.x.x.x -p xxxx -u xxx -pw xxxx -f test.csv

11:49:11.061 [main] DEBUG org.apache.iotdb.rpc.AutoResizingBuffer - org.apache.iotdb.rpc.AutoResizingBuffer@12843fce expand from 65536 to 16384000, request: 16384000
Encounter an error when connecting to server, because org.apache.iotdb.rpc.StatementExecutionException: 600: Authentication failed.

Tried several users and also get the "Authentication failed" error. Configured ssh passwordless between the hosts.

2. The nodetool.sh output:

./nodetool.sh -h x.x.x.x host

nodetool: Failed to connect to 'x.x.x.x:31999' - ConnectException: 'Connection refused (Connection refused)'.

In iotdb-env.sh:

JMX_PORT="31999"

But there is no process listen on 31999 after "nohup sbin/start-node.sh >/dev/null 2>&1 &".