We are using facileManager for DNS purposes and we ran into a missing option in zone definition: forward only / forward first. As explained here http://www.zytrax.com/books/dns/ch7/queries.html#forward, if set to 'only' the server will only forward queries, if set to 'first' (default) it will send the queries to the forwarder and if not answered will attempt to answer the query.This statement may be used in a zone, view or a global options clause.
Although on facileManager you can set the forward option in view and options, there's no way to set it in zone. There should be a dropdown to choose between only and first when defining the zone as forward.
In our case we needed to use a forward only, so we solved the issue by changing this line in file classes/class_buildconf.php: