OK, I just Googled your error message. It looks like this is to do with the SSL certificate for the server. This erroroccurs if the hostname in the URL does not match the hostname in the certificate. This doesn't look like a Talend issue, but a certificate issue. Google "https hostname wrong" to find a solution.
Try unchecking "Check Server Identity". Note that this should only be done in a "test" environment. The underlying problem is that the certificate in question does not have the correct CName for the host in question.
I am encountering the same issue. Even after unchecking "Check Server Identity" in the tRESTClient, I continue to get this error. Was anyone able to resolve?
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