2912. [func] Windows clients don't like UPDATE responses that clear

                        the zone section. [RT #20986]

CHANGES

+2912.	[func]		Windows clients don't like UPDATE responses that clear
+			the zone section. [RT #20986]
+
 2911.	[bug]		dnssec-signzone didn't handle out of zone records well.
 			[RT #21367]
 

lib/dns/message.c

@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: message.c,v 1.253 2010/05/13 00:40:46 marka Exp $ */
+/* $Id: message.c,v 1.254 2010/06/03 05:23:27 marka Exp $ */
 
 /*! \file */
 
@@ -2527,7 +2527,9 @@ dns_message_reply(dns_message_t *msg, isc_boolean_t want_question_section) {
 	if (msg->opcode != dns_opcode_query &&
 	    msg->opcode != dns_opcode_notify)
 		want_question_section = ISC_FALSE;
-	if (want_question_section) {
+	if (msg->opcode == dns_opcode_update)
+		first_section = DNS_SECTION_ADDITIONAL;
+	else if (want_question_section) {
 		if (!msg->question_ok)
 			return (DNS_R_FORMERR);
 		first_section = DNS_SECTION_ANSWER;