Thanks @Geoffrey Shelton Okot The issue has been resolved. Again I came to know the importance of /etc/hosts file. It's not the firewall that was blocking the connection rather the process was spawned internal to the instance - meaning none of the other instance could access the process. Zookeeper process looks for the ip address from /etc/hosts file and spawns the process, instead of fetching the ip address it took the loopback address(127.0.0.1) which made sure the outside world cannot access the process. Followed the thread to resolve the issue MeaningOfIPaddressinProcess ... View more