I have the issue explained here:
javax.net.ssl.SSLException in jMeter
The server tham I am testing is using RSA keys, so I should try third option from answer given in above question. But I don't know how to do this "change your client to only negotiate that." I am not writing my own code, and have no idea how to force Java or JMeter to handle this. I wanted to add a comment on question but, I still have no rights to post a comment, so I am posting another question.