I have just purchased the soundtouch 20. I have set the system up and added my iTunes music library which I can see but it will not play the music, just keeps coming up with an error message. I have tried turning off the firewall and this makes the system work. I have changed the firewall settings in mcaffe to enable the soundtouch app but this is not working. I have to switch the firewall off fully to make this work. Any ideas how I can resolve this please?