NX-DOMAIN means "domain doesn't exist". Its default setting is YES. Turning if off can cause problems with older software. If yes is set, the AA bit is always set on NXDOMAIN responses, even if the server is not actually authoritative. You should decide whats best for you but it shouldn't matter if you leave it alone.
John D. Saucier
jsauce@magicguild.com
Certified Technician
Network Administrator
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