DNS Migration Issue

I'm currently in the process of moving a number of domains over to new DNS servers. Currently rehersing it on a test account. Basically the domain itself is pointing at the the soon-to-be-old nameservers, which have been primary. I have set up the new Zone files on the new nameserver, and want to switch the active nameservers (via Plesk) from masters to slaves of the new box.

It however just isnt working. The original nameservers are simply not trying to query the new server, and instead are throwing back a 2(SERVFAIL)! and cannot find host.

Help is much appreicated. Thanks

 

 

 

 

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