Having finally found the solution by myself, for those who encounter the problem with the Free ISP, configure the Freebox router mode (though it has its own router!). Since then, everything works fine.
He may be accused of being slow connection: do not expect to hear the music from the ignition!
The selection of the many radios is very ergonomic, fortunately there are presets.
For access to the DLNA server (Twonky Server), it works correctly even if we frequently refresh the server list at startup (it often loses the connection when you put the unit in standby). The dedicated application AudioRemote on iphone / ipad allows the selection of pieces and the remote volume.
The sound is quite good for a chain micro and value for money remains excellent. Too bad I lost a month to work properly ...