Hi FirstTracks,
Your *.subsonic.org address has nothing to do with your
internal ip-adress. It's just a DNS-registration pointing to your
external ip-adress.
Firstly check if you can log in to your Subsonic using the internal ip-adress: so
http://192.168.0.192 should open the proper webpage.
If it doesn't then you'll need to find out on what port Subsonic is listening.
You find out what port your subsonic-setup is using by logging in to the pc where you installed Subsonic.
Open the subsonic Control panel by clicking on the Subsonic tray Icon. On the tab Settings you'll find what port Subsonic is currently using.
If the port is 8080 then you use
http://192.168.0.192:8080.
If that works then you're ready to go to the next step.
I suggest you first find out your external ip-adress by visting a site like
http://whatismyip.org. Write that down.
Now open your webbrowser and type in:
http://External ip:Port Subsonic. ( EG:
http://212.313.414.100:8080)
If you get a webpage cannot be displayed error, then you know that there's something wrong with your portforwarding.
From here it's quite simple:
Log in to your router, and define a portfowarding to 192.168.0.192.
Test that again with
http://External ip:Port Subsonic.
If that works you should be able to use your *.subsonic.org adress again. That is, if your ISP hasn't changed your external-ipadress since you first registered your *.subsonic.org-adress.
In that case you log in to subsonic as admin via the internal ip-adres, go to Settings / Network and click save again.
It will take some time before your DNS-record is updated, so have patience. I believe that the dns-server is refreshed every 12 hours or so.