How to restrict profile manager to SSL?

I have just setup Profile Manager 3.0.2 on OS X 10.9.1 (Mavericks). The setup works fine, but I noticed that I can access profile manager over SSL and regular HTTP. I would like to restrict access to using SSL, but I don't know. Can someone please direct me to how I restrict access to profile manager to only allowing secure connection. Please be clear as I am new to OS X. Thanks.