You are probably running into a cross domain issue in that different protocols (and things like sub domains) require security sandbox configurations.
Unfortunately, this is not really a SWFObject related question, but more a general Flash one (which means you most likely won't get the help or answers you require from this list). I'd have a read up on the Flash security whitepaper so that you have a good understanding of the way things are locked down, and how a admin can open up communications to trusted locations.
I would also install the debug version of the Flash player so that you can view any runtime security errors or exceptions.
In addition, an http traffic monitoring program like service capture or charles can show what is going on behind the scenes.
Cheers,
Aran