Please make sure you use this example string
"?ssl=true&sslfactory=com.amazon.redshift.ssl.NonValidatingFactory" . On which talend build version you got this issue?
You are more than welcome to 'follow' the jira TDI-32281 so you can be notified when it is placed on the roadmap for release. Link to JIRA: https://jira.talendforge.org/browse/TDI-32281