DNS on F13

I had configured a local DNS server under F12 and everything was working fine. I upgraded the system to F13 and setup DNS again. Now I see the following errors. Nov 9 15:46:28 darkstar named[17913]: validating @0xb4e48968: dlv.isc.orgSOA: got insecure response; parent indicates it should be secure Nov 9 15:46:28 darkstar named[17913]: error (insecurity proof failed) resolving 'dlv.isc.org/DLV/IN': 168.158.8.15#53 Nov 9 15:48:02 darkstar named[17913]: validating @0xb49766e8: dlv.isc.orgSOA: got insecure response; parent indicates it should be secure Nov 9 15:48:02 darkstar named[17913]: validating @0xb4977160: dlv.isc.orgSOA: got insecure response; parent indicates it should be secure Nov 9 15:48:02 darkstar named[17913]: validating @0xb4977bd8: dlv.isc.orgSOA: got insecure response; parent indicates it should be secure Nov 9 15:48:02 darkstar named[17913]: error (no valid RRSIG) resolving ' howtoforge.com.dlv.isc.org/DS/IN';: 168.158.8.15#53 Nov 9 15:48:02 darkstar named[17913]: error (insecurity proof failed) resolving 'howtoforge.com.dlv.isc.org/DLV/IN': 168.158.8.15#53 Nov 9 15:48:02 darkstar named[17913]: validating @0xb4724d60: dlv.isc.orgSOA: got insecure response; parent indicates it should be secure Nov 9 15:48:02 darkstar named[17913]: error (no valid RRSIG) resolving ' www.howtoforge.com.dlv.isc.org/DS/IN';: 168.158.8.15#53 Nov 9 15:48:02 darkstar named[17913]: error (insecurity proof failed) resolving 'www.howtoforge.com.dlv.isc.org/DLV/IN': 168.158.8.15#53 I have 2 servers configured in the forwarders section of named.conf forwarders { 68.2.16.30; 168.158.8.15; }; It only complains about the second one. I found Bug 577639 which seems related, but it's marked closed notabug. So if it's not a bug why am I seeing these errors and how do I go about resolving them? Is this a configuration issue on my side, or is this an issue with my ISP? The file "/etc/named.iscdlv.key" contains the correct key. Any assistance is appreciated. Paolo