Which bind server are you using ? bind 9.0.0 ?
If you are using bind 9.0.0, Check for rndc.conf file you must have a rndc.conf file in order to start rndc (rndc start).

Have you tried using the ip address as the source = in the input. Without access to the DNS, perhaps it can't resolve the =
ns2.xxxxxx.com.