Can you post the output of "netstat -anp|grep "LISTEN"|grep java" from all the 3 nodes?
Also compare seconds nodes yaml with new nodes yaml and see what diff. you find, if any. Another thing try telnet tests from seed node to the new node. -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/EC2-node-adding-trouble-tp6399102p6403602.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.