Server 2008 DNS Resolution Issue

Last week after making a change to our 2008 DNS infrastructure we started getting a re-occurring error where DNS requests for certain top level domain were not being resolved. After investigating the issue for a bit it turned out there was an error with the way server 2008 DNS handles TTL (Time To Live). The issue causes .co.uk domains to become unresolvable (as well as other domains that have circular dependencies).

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