Storm UI Internal Server Error for remote cluster

[Chun Yuen Lim]

I'm following
http://jayatiatblogs.blogspot.com/2011/11/storm-installation.html .
I try to configuring Apache Storm remote cluster in Amazon Web Services and
I face the error below in my Storm UI:

    org.apache.thrift7.transport.TTransportException:
java.net.ConnectException: Connection refused
    at org.apache.thrift7.transport.TSocket.open(TSocket.java:183)
    at
org.apache.thrift7.transport.TFramedTransport.open(TFramedTransport.java:81)
    at backtype.storm.thrift$nimbus_client_and_conn.invoke(thrift.clj:75)
    at backtype.storm.ui.core$cluster_configuration.invoke(core.clj:472)
    at backtype.storm.ui.core$fn__8260.invoke(core.clj:844)

This is my storm.yaml file for my master node at 10.0.0.230:

    ########### These MUST be filled in for a storm configuration
     storm.zookeeper.servers:
         - "10.0.0.230"
    #     - "localhost"
    #
     storm.zookeeper.port: 2181

     nimbus.host: "127.0.0.1"
     nimbus.thrift.port: 6627
    # nimbus.task.launch.secs: 240

    # supervisor.worker.start.timeout.secs: 240
    # supervisor.worker.timeout.secs: 240

     ui.port: 8772

     storm.local.dir: "/home/ubuntu/storm/data"

     java.library.path: "/usr/lib/jvm/java-7-oracle"

    # supervisor.slots.ports:
    #     - 6700
    #     - 6701
    #     - 6702
    #     - 6703
    #     - 6704

    # worker.childopts: "-Xmx768m"
    # nimbus.childopts: "-Xmx512m"
    # supervisor.childopts: "-Xmx256m"

Below is my storm.yaml file for slave node at 10.0.0.79:

    ########### These MUST be filled in for a storm configuration
     storm.zookeeper.server:
         - "10.0.0.230"
    #     - "localhost"
     storm.zookeeper.port: 2181

    # nimbus.host: "localhost"
     nimbus.host: "10.0.0.230"
     nimbus.thrift.port: 6627
    #
    #ui.port: 8772
    #
     storm.local.dir: "/home/ubuntu/storm/data"
     java.library.path: "/usr/lib/jvm/java-7-oracle"

     supervisor.slots.ports:
         - 6700
         - 6701
         - 6702
         - 6703
    #     - 6704
    #
    # worker.childopts: "-Xmx768m"
    # nimbus.childopts: "-Xmx512m"
    # supervisor.childopts: "-Xmx256m"

Below is my zoo.cfg file for master node:

    tickTime=2000
    initLimit=10
    syncLimit=5
    dataDir=/home/ubuntu/zookeeper-data
    dataLogDir=/home/ubuntu/zookeeper/log/data_log
    clientPort=2181
    server.1=10.0.0.230:2888:3888
    autopurge.snapRetainCount=3
    autopurge.purgeInterval=24

I had use zkServer.sh start, storm nimbus & storm ui in master node; storm
supervisor in slave node. The myid for master node is 1 & the myid for
slave node is 2.

What is the cause of error? how to solve it?