amazon web services - Zookeeper in AWS VPC - This ZooKeeper instance is not currently serving requests -

i'm trying setup mesos cluster in aws vpc. i've setup 3 ubuntu machines mesos according this tutorial.

the problem inside web ui see message no master leading ... , when ssh of 3 master machines , run echo srvr | nc localhost 2182 this zookeeper instance not serving requests on of them.

i can't ping between 3 servers.