Subsonic plugin won't update web address

Hello,

I have installed the subsonic plugin, am able to access the web UI and scan music folder.

The issue I'm having is that the subsonic server is not updating the dynamic DNS URL; on the "Network" setup page I get the error message, "Status: Could not connect to xxxxxx.subsonic.org. (HttpHostConnectException) ".  This currently works from my old (Windows) subsonic install, so I'm guessing there is some configuration subtlety that I am missing.

Any help much appreciated.

FreeNAS 9.10.2...

Subsonic plugin won't update web address