hint zone conflicts with allow-query statement !

[Hans]

> acl "acl_cache_clients" { 127.0.0.0/8; localnet; };
>
> zone "." {
>        type hint;
>        file "/etc/bind/db.root";
>        allow-query { "acl_cache_clients"; };
> };

Type hints means that this not an zone.
And there for the allow-query option is useless.
It is only used to bootstrap the server.

> I have another bind9 running on another Debian Sarge server, and it works
> well with same config for the hint zone !!!
> So what could go wrong with my config ???

And that server is running the same version of Bind ?
It is useless, so remove it.