Hello,
Some DMZ admins use DNS for the DMZ also.
If you defined the client via FQDN it may attept to quiry DNS servers, 
especially if DNS servers are listed in clients TCP\IP Setup.
If you do not use DMZ DNS servers, make sure you have atleast host files 
configured correctly.
Not sure if you use server\client  side host file or not, check your name 
resolutions and adjust accordingly.
Networker is heavy on reverse name resolution.
HTH

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