named[10976]: client 42.62.24.166#38815: query (cache) 'myview.51cdn.com/A/IN' denied

The new bind version 9.3.6 (Redhat 5.4) try to use IPv6 transport even if the server host does not have IPv6 connectivity, resulting in slower name resolution.

Sep 2 19:43:16 cpanel named[22767]: network unreachable resolving 'ns.isc.afilias-nst.info/A/IN': 2001:500:7::79#53

To fix this you have to start the bind damon with "-4" (IPv4 only). You can add the line "OPTIONS="-4"" to /etc/sysconfig/named to do so.