Redshift connection issue with new RS driver w/ ACM

I just tried it with the new driver RedshiftJDBC42- It would failed with following error intermittently. I tried doing the same with sql/workbench and it seem stable and able to connect time after time.

Amazon](600000) Error setting/closing connection: General SSLEngine problem

driver class:
URL parameters: ssl=true&sslmode=verify-full