First of all, thanks a lot for making this available through the Amazon store too. This means that Kindle owners can use it without having to ‘root’ the device. Some of us suggested this in the now closed “Cubase iC Pro for Android available soon” thread and Steinberg listened. 
About connection problems, my firewall had very restrictive settings for local network too, and so I had to ‘trust’ the computer’s local IP address to make it work. In fact, Cubase freezes at opening while loading the SKI module if the local IP is not trusted by the firewall.
Also, I need to ‘trust’ the local IP address of my Kindle tablet to make the computer’s name appear in the app’s opening page so that I don’t have to write the host’s IP every time.