getting "Installation failed. Failed to receive heartbeat from agent." error while installing CDH4 in EC2 using elastic IP

I have getting "Installation failed. Failed to receive heartbeat from agent."
error while installing CDH4 in EC2 using elastic IP. I have done the
followings:
Put below entries in /etc/hosts of each node
127.0.0.1 localhost
::1 localhost6
<Elastic IP1> ec2-IP1.ap-northeast-1.compute.amazonaws.com
<Elastic IP2> ec2-IP2.ap-northeast-1.compute.amazonaws.com
ec2-IP1.ap-northeast-1.compute.amazonaws.com ip-<private
ip1>.ap-northeast-1.compute.internal
ec2-IP2.ap-northeast-1.compute.amazonaws.com ip-<private
ip2>.ap-northeast-1.compute.internal
<PrivateIP1> ip-<private ip1>.ap-northeast-1.compute.internal
<PrivateIP2> ip-<private ip2>.ap-northeast-1.compute.internal

From cloudera admin UI, I choose "*Launch the class wizard*".

And at the "*Specify hosts for your CDH cluster installation.*" page, I put
following entries
ec2-IP1.ap-northeast-1.compute.amazonaws.com,
ec2-IP2.ap-northeast-1.compute.amazonaws.com

And press the search button and then press the continue button.

*Here to mentioned that, if I specify private IPs over there at "Specify
hosts for your CDH cluster installation." page, CDH4 installation completed
successfully. But I can't browse 50070 and 50030 using elastic IP.*

Please help me get out of this problem.


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