SSL "unknown protocol" error

Using Stout 1.2.3, I cannot preview my calendar. I get the following error : “The following error(s) occurred: http_request_failed
error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol”
Using another blog, on another server, I can see my calendar using Stout 1.0.3.
Calendar embed : <iframe src=”https://www.google.com/calendar/embed?height=600&wkst=1&bgcolor=%23FFFFFF&src=repondreagauche31%40gmail.com&color=%23182C57&ctz=Europe%2FParis&#8221; style=” border-width:0 ” width=”800″ height=”600″ frameborder=”0″ scrolling=”no”></iframe>
Thanks.