关于开启某一个节点开启ssl后无法组建集群

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RT，
集群配置如下，node3配置了ssl，用mqtt fx来进行ssl连接是可以成功的。多谢指教：）

node_name node1
node_address 127.0.0.1:18831
node_remote_username cluster_node
node_remote_password 1JmJccq
node_remote_clientid node1_1

node_name node2
node_address 127.0.0.1:18832
node_remote_username cluster_node
node_remote_password 1JmJccq
node_remote_clientid node1_2

node_name node3
node_address 127.0.0.1:18833
node_remote_username cluster_node
node_remote_password 1JmJccq
node_remote_clientid node1_3
node_cafile /etc/mosquitto/ca.crt

node3 log ：
1555991823: OpenSSL Error: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca
1555991823: OpenSSL Error: error:140940E5:SSL routines:SSL3_READ_BYTES:ssl handshake failure
1555991823: Socket error on client , disconnecting.
1555991825: OpenSSL Error: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca
1555991825: OpenSSL Error: error:140940E5:SSL routines:SSL3_READ_BYTES:ssl handshake failure
1555991825: Socket error on client , disconnecting.