Could you please elaborate in some more detail exactly what the architecture of this looks like, at the moment it is hard to understand where SSL fits in from your original description.
Actually the application is working under HTTP. it communicates with another application through webservices through HTTP. I have no hand on the other application so we cannot migrate it to ssl (proprietary).
We want to have our application interactions going through HTTPS, excpet for this other application that will might keep calling our webservices exposed (on our application) through HTTP.