Hm, my bad. There was an error in the code for registering new devices. Sorry about that, did some changes there to support Kindle for PC and forgot to test registration with my Kindle as well.
I've fixed the code and tested properly this time on my Kindle. You should pull the latest version from git before trying again.
Other than that, the configuration looks fine in config.py and ServerConfig as well.
Thanks for testing it
.
Cheers,
-pwr