I've had this problem for years and I can't find a solution on the forums.
My IP address is dynamic. It changes often enough for me to use a DYNDNS redirection for many things other than subsonic. I purchased the premium version with several donations over the years and registered tripaphonic.subsonic.org as my address and every time my IP changes this DNS redirection stops working. I end up having to message Sindre to get it fixed and that takes time because he's a busy guy... as we all are. Is there a solution to this problem yet?
How are the IPs updated for people who have premium service with DNS redirection over subsonic.org???