Forwarding to master server doesn't work?

[Jeff Stevens]

I'm working on a customer configuration that I replicated, and he uses a
slave server to slave one domain from a master and uses forwarding to
the master for all other queries that come to the slave server.  Queries
to the slave for names in the slaved zone work, but queries to the slave
for names outside the slaved zone (which the master should "know") don't
get a response (forwarding isn't working?).  I'm wondering what I need 
to look at here...

The relevant slave zone portions are:

options {
	recursion yes;
	forward only;
	forwarders {
		 9.5.56.157;
	};
	listen-on port 54 {
		9.5.129.153;
	};
	query-source address * port *;
};

zone	"S020AG00.BRANCH.AGF" {
	type slave;
	masters {
		9.5.56.157;
	};
	forward only;
	check-names ignore;
	dialup no;
	max-transfer-time-in 60;
	notify yes;
};


Query to master for a domain shows it exists:


D:\CheckOut>dig @rs018 s02tb100.branch.agf.

; <<>> DiG 9.3.0rc4 <<>> @rs018 s02tb100.branch.agf.
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 168
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;s02tb100.branch.agf.           IN      A

;; ANSWER SECTION:
s02tb100.branch.agf.    86400   IN      A       9.5.56.157

;; AUTHORITY SECTION:
branch.agf.             86400   IN      NS      s02tb100.branch.agf.

;; ADDITIONAL SECTION:
s02tb100.branch.agf.    86400   IN      A       9.5.56.157

;; Query time: 30 msec
;; SERVER: 9.5.56.157#53(rs018)
;; WHEN: Fri Dec 10 12:34:15 2004
;; MSG SIZE  rcvd: 83


Query to the slave give no answer, althought the forwarding is setup:


D:\CheckOut>dig @rchmach  -p 54 s02tb100.branch.agf.

; <<>> DiG 9.3.0rc4 <<>> @rchmach -p 54 s02tb100.branch.agf.
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 1323
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;s02tb100.branch.agf.           IN      A

;; Query time: 10 msec
;; SERVER: 9.5.129.153#54(rchmach)
;; WHEN: Fri Dec 10 12:40:15 2004
;; MSG SIZE  rcvd: 37