no login at sonos

[klingenstein]

hi all,
till yesterday with subsonic all has been gooood as in the last years!
Sonos connects to the DS415+ got the (there being) subsonic server (premium account!) logged-in silently and i had my playlists playing.
I always could read the extern directories via Sonos at the NAS.
today - sonos doesn't connect to xxxxxx:4040. (nothing has been changed in the system) error 503 is repeated.
Naturally I can read the data with the Explorer, but that's no help you know.
don't get a laugh, installing the Subsonic.exe on pc - all good, registration is recognized, but no connection with sonos.
Sonos presents the service as usuall but requests new registration wich then doesn't be recognized.
any idea? I hope you can read me, sorry for my mean english!!

Wolfgang