I have a Plesk server that I use for hosting some random clients and other websites, and I wanted to get the internal DNS working correctly. The instructions provided with the slave DNS extension do not work ( at least not with Debian 8 ). To get this working I needed to add their configuration stuff to the named.conf.local, change the long rndc key string to just rndc-key, and remove that long string from the keys array in the controls section.