Hi Sai Aditya P,

You can securely connect to the below endpoints in the HDInsight cluster with an SSH client. 

Step1: Go to created HDInsight Cluster => Under settings => SSH + Cluster login => Select Hostname => Click on copy "ssh sshuser@chepra-ssh.azurehdinsight.net".

Step2: Open putty => Enter Hostname and port number

Hostname: sshuser@chepra-ssh.azurehdinsight.net

Port: 22

Note: If you are copying Hostname from Azure Portal, try to remove ssh and paste in putty.

It should be sshuser@chepra-ssh.azurehdinsight.net and not "ssh sshuser@chepra-ssh.azurehdinsight.net".

Step3: Enter password to login: **********

Successfully connected to HDInsight cluster using putty.

For more details, refer "Connect to HDInsight using SSH".

Hope this helps.