Internal AD Domain Name Conflicts with External Domain Name

Trying to allow internal users to connect to same web server name that external users use but having problems.
My web server's internal computer name is InfoReference.AZ.mydomain.com (AZ.mydomain.com is internal Active Directory domain name).
External users connect to this web server via https://inforeference.mydomain.com.
When internal users try to use the same URL it does not work. It's the "AZ" part of the internal domain name causing the issue I believe.
I tried to create a CNAME alias but it won't let me enter it without the "AZ".
I tried a HOST file entry (not preferred), but it didn't work anyway.
Any suggestions for how to handle this? Let me know if more info is required.
TenragsDirectory, Information TechnologyAsked:
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Toni UranjekConsultant/TrainerCommented:
Create new primary zone for inforeference.mydomain.com on internal DNS and assign IP to this zone and it should work.

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Neil PreeperCommented:
Toni's method is the prefered method. Don't forget to add your external A records that are not hosted in your internal network.
TenragsDirectory, Information TechnologyAuthor Commented:
This worked beautifully! Thank you!
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