elasticsearch节点无法加入集群

[2016-04-13 15:31:06,108][WARN ][discovery.zen.ping.unicast] [node-9973] failed to send ping to [{#zen_unicast_1#}{172.16.20.70}{172.16.20.70:9300}]
RemoteTransportException[[node-9970][172.16.20.70:9300][internal:discovery/zen/unicast]]; nested: IllegalArgumentException[tampered signed text];
Caused by: java.lang.IllegalArgumentException: tampered signed text