I have a problem with bind9 running on Ubuntu Server 12.10. It refuses to resolve the external domain housing.org.uk even though it resolves all other external domains. I can do:
dig housing.org.uk @22.214.171.124
and it works fine. If I do:
dig housing.org.uk +trace
it ends with:
housing.org.uk. 172800 IN NS b.adns.mdnx.net. housing.org.uk. 172800 IN NS a.adns.mdnx.net. dig: couldn't get address for 'b.adns.mdnx.net': failure
There are no forwarders and DNS works fine for everything else. Disabling the firewall briefly made no difference. Any ideas?