'Unable to connect AWS EMR from SQL Workbench

I am learning AWS and as part of practice I am trying to connect AWS EMR using SQL Workbench. However, I am unable to do so due to error : Could not initialize SSH tunnel : java.net.unknownHostException. Please note that I am able to connect AWS EMR using putty.

Can you please advice?

amazon-emrsql-workbench-j


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