Proxy error while starting services in Ambari 2.2

[#1]

I'm trying to set up a single-node Hadoop cluster (HDP2.3 version) using Ambari 2.2 in Eucalyptus environment.

I have used Private IP address as recommended while registering the VM's (RHEL 6.5) with Ambari.

When I tried to bring up Hadoop services (MR2, Hive, Yarn) , I'm getting the below error:

 <LI id=L_11001_11>Error Code 11001: Host not found
<LI id=L_11001_12>Background: This error indicates that
the gateway could not find the IP address of the website you are trying to
access. This is usually due to a DNS-related error.
<LI id=L_11001_13>Date: 2/9/2016 5:57:11 AM [GMT]
<LI id=L_11001_14>Server: FIESPRX004.xxx.net
<LI id=L_11001_15>Source: DNS error
</UL>

[#2]

The JDK version is 1.6.0

[#3]

Ambari 2.2 does not support JDK 1.6, upgrade to latest 1.7 or 1.8 @Phoncy Joseph

read the docs http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_upgrading_Ambari/content/_preparing_to_up...

[#4]

Noted. Thank you.