Is your station setup on your pc behind your router ?
If thats the case you may not be able to tune in from your
pc as your router may be configured to not let you access your public ip address.
You should check with a friend to see if the can connect using the app/widget.
Although the above would not explain why xmms is able to
tunein and not the widget.
Sorry if my advice today leads nowhere its been a very busy 2 weeks