Unable to connect to Confluence Jumpbox and cluster using SSH on Azure?

[suryaprasad23]

https://confluence.atlassian.com/doc/administering-confluence-data-center-on-azure-937176454.html

I followed above mentioned steps to connect to jumpbox & cluster instance using SSH on azure.  I was able to connect to Jumpbox but unable to connect to conf cluster.

I need to change my tomcat settings, can some one please help here.

I am attaching below SSH command log for reference.

I am able to ping to cluster, but unable to connect. 

My Log: 

PS /home/USERNAME/.ssh> ssh -i <Private_key> <SSH_USER>@<MY_JUMPBOX_IP>
Enter passphrase for key '<Private_key>':
Welcome to Ubuntu 18.04.4 LTS (GNU/Linux 5.0.0-1035-azure x86_64)

* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage

System information as of Mon Apr 13 04:35:16 UTC 2020

System load: 0.21 Processes: 125
Usage of /: 8.8% of 28.90GB Users logged in: 1
Memory usage: 50% IP address for eth0: XX.X.XX.X
Swap usage: 0%

21 packages can be updated.
21 updates are security updates.

Last login: Mon Apr 13 04:29:21 2020 from XX.XXX.XXX
USERNAME@MY_JUMPBOX_IP:~$ ssh ADMIN_NAME@XX.X.X.X
ADMIN_NAME@XX.X.X.X: Permission denied (publickey).
USERNAME@MY_JUMPBOX_IP:~/.ssh$ ping XX.X.X.X
PING XX.X.X.X (XX.X.X.X) 56(84) bytes of data.
64 bytes from XX.X.X.X: icmp_seq=1 ttl=64 time=0.941 ms
64 bytes from XX.X.X.X: icmp_seq=2 ttl=64 time=1.08 ms
64 bytes from XX.X.X.X: icmp_seq=3 ttl=64 time=1.59 ms