Zookeeper Service showing "bad health" after deployment

[#1]

I just finished installing a new cluster but failed to start the zookeeper service. Each instance started but had the "bad health" flag. The zookeeper log on node 3 showed this error repeatedly. 

++++
Cannot open channel to 1 at election address node1/61.62.63.1:4181
java.net.ConnectException: Connection refused
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On node 3, the connection to node 1 zookeeper port showed no issue.

$ nc -zv node1 4181
Ncat: Version 7.92 ( https://nmap.org/ncat )
Ncat: Connected to 61.62.63.1:4181.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.

On node1, the zookeeper port is open too
$ ss -tulnp | grep 4181
tcp LISTEN 0 50 61.62.63.1:4181 0.0.0.0:*

The private cloud base cluster is 7.1.9 sp1.

Thank you.

Regards,

[#2]

@Seaport Hello team @pajoshi @shubham_sharma 
Do you have any insights here? Thanks!