I'm getting this error on a site I've just setup. The fixes I've seen around suggest that a fix is to be sure the default-ssl site is enabled, which I have done, but am still getting the error.
That usually means that you are sending a HTTPS request to a HTTP service. The message is from the browser complaining that it was unable to to complete the SSL handshake that it was expecting.
do you have
configured for that vhost?