DO NOT USE 443 on a WHS server machine (any flavour) - that is the standard ssl port used by IIS.
You can use any other port (I use 444 for testing) - but don't forget if upnp is not working on your router you will need to forward that port as well.
I don't bother with ssl for subsonic - if any determined hacker (or government agency) wants to break in to my server to listen to my collection of Black Sabbath albums then I say let them - although it would be easier to just ask for the guest a/c password
