IPv6 TCP vs. UDP in 9.4.0

[Jeffrey Stevens]

Why does TCP get refused when UDP passes?  I'm running the query on the
same box as the server and I'm using the following in named.conf:

acl test-acl {
 192.168.0.0/16;
 fe80::/64;
 2002::/16;
};

zone "subnet.rchland.ibm.com" {
     type master;
     file "subnet.rchland.ibm.com.DB";
     check-names ignore;
     notify yes;
     database rbt;
     dialup no;
     zone-statistics no;
     max-transfer-idle-out 60;
     max-transfer-time-out 120;
     zero-no-soa-ttl yes;
     allow-update { test-acl; };
     allow-query { test-acl; };
     check-integrity yes;
     check-mx warn;
     check-wildcard yes;
};


; <<>> DiG 9.4.0 <<>> -q subnet.rchland.ibm.com -t ns
@2002:905:150e:251:209:6bff:fe65:94cb -b
2002:905:150e:251:209:6bff:fe65:94cb
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 596
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 6

;; QUESTION SECTION:
;subnet.rchland.ibm.com.        IN    NS

;; ANSWER SECTION:
subnet.rchland.ibm.com.    86400    IN    NS    isa2lp06.rchland.ibm.com.
subnet.rchland.ibm.com.    86400    IN    NS    isa2lp06.rchland.ibm.com.

;; ADDITIONAL SECTION:
isa2lp06.rchland.ibm.com. 86179    IN    A    9.5.176.200
isa2lp06.rchland.ibm.com. 86400 IN    A    9.5.176.200
isa2lp06.rchland.ibm.com. 86400 IN    AAAA    3ffe:50::900e:d0ff:fe00:6002
isa2lp06.rchland.ibm.com. 86400 IN    AAAA    4ffe:41::214:5eff:fe47:8199
isa2lp06.rchland.ibm.com. 86400 IN    AAAA    1ffe:31::214:5eff:fe47:8198
isa2lp06.rchland.ibm.com. 86400 IN    AAAA   
2002:905:150e:251:209:6bff:fe65:94cb

;; Query time: 20 msec
;; SERVER:
2002:905:150e:251:209:6bff:fe65:94cb#53(2002:905:150e:251:209:6bff:fe65:94cb)
;; WHEN: Wed Mar 28 19:54:56 2007
;; MSG SIZE  rcvd: 235

; <<>> DiG 9.4.0 <<>> -q subnet.rchland.ibm.com -t ns
@2002:905:150e:251:209:6bff:fe65:94cb -b
2002:905:150e:251:209:6bff:fe65:94cb +tcp
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 880
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;subnet.rchland.ibm.com.        IN    NS

;; Query time: 22 msec
;; SERVER:
2002:905:150e:251:209:6bff:fe65:94cb#53(2002:905:150e:251:209:6bff:fe65:94cb)
;; WHEN: Wed Mar 28 19:55:06 2007
;; MSG SIZE  rcvd: 40