Unsupported or unrecognised message

I'm following the steps in order to test a mockservice with ssl, as https://www.soapui.org/docs/soap-mocking/securing-mockservices-with-ssl/ indicates, but when I change the request to https, the following error appears:

ERROR:Exception in request: javax.net.ssl.SSLException: Unsupported or unrecognized SSL message

What I'm doing wrong?

Any help?