forward queries/transfer refused

[Tyler Parkin]

Hello,

We have a customer who is requesting that we forward reverse zone
queries to his dns server.

In /etc/named.conf I have:

zone "20.97.63.in-addr.arpa"
  { type forward; 
    forward only; 
	forwarders {63.82.200.21;};
};

I am receiving the following xfer errors in /var/log/messages:

Jun 25 10:00:00 ns1 named[12024]: slave zone "20.97.63.in-addr.arpa"
(IN) loaded (serial 6)
Jun 25 10:06:07 ns1 named[12024]: secondary zone "20.97.63.in-addr.arpa"
expired
**Jun 25 10:06:07 ns1 named-xfer[24457]: [[208.211.173.2].3309] transfer
refused from [63.82.200.21], zone 20.97.63.in-addr.arpa
**Jun 25 10:16:07 ns1 named-xfer[31639]: [[208.211.173.2].3320] transfer
refused from [63.82.200.21], zone 20.97.63.in-addr.arpa
**Jun 25 10:26:08 ns1 named-xfer[6517]: [[208.211.173.2].3327] transfer
refused from [63.82.200.21], zone 20.97.63.in-addr.arpa
Jun 25 10:30:20 ns1 named[12024]: ns_resp:
query(1.20.97.63.in-addr.arpa) contains our address
(ns1.innova.net:208.211.173.2) learnt (A=innova.net:NS=198.6.1.83)
[UUnet forwarding the request to us]
**Jun 25 10:36:12 ns1 named-xfer[14055]: [[208.211.173.2].3334] transfer
refused from [63.82.200.21], zone 20.97.63.in-addr.arpa     

I'm a little confused by the "transfer refused" part.  Is that his
server refusing to transfer the zone to ours, or is our server trying to
transfer a zone (how? which one?) to his server and his is refusing it? 
I'm not dead set on doing it this way.  If there is a better way to
forward the queries to his server, let me know.  I searched through the
archives, but didn't see it.  To be clear, his network is NOT part of
ours, and he is running his own primary DNS.

Thanks,

Tyler Parkin
tylerp at innova.net