facebook.com not resolving with an internal bind9 caching DNS server but resolved against external OpenDNS server

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http://serverfault.com – We have a local caching server at our office using bind9. From this morning onwards, users are not able to go to facebook.com. All other sites are working. A local query against our local DNS serve gives me this: dig @localhost www.facebook.com ;; QUESTION SECTION: ;www.facebook.com. IN A ;; ANSWER SECTION: www.facebook.com. 30 IN CNAME www.yy.facebook.com. ;; AUTHORITY SECTION: facebook.com. 2997 IN SOA ns0.facebook.com. dns.facebook.com. 2012030101 7200 1800 604800 3600 And a query for the CNAME record gives me this dig @localhost www.yy.facebook.com ;; QUESTIO (HowTos)