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Question DNS for subdomains not working on a private domain

jjohnsonmvdexpress

New Pleskian
I have taken over a Plesk setup that the previous administrator is not available to offer support. I am also new to Plesk.

We have VPN based internal private network, so the domains in question are only accessible from the Plesk server over the VPN.

I have a domain that is working, for example: ecommerce.ad.mydomain.com

I setup a subdomain from there, dev.ecommerce.ad.mydomain.com.

I setup my windows 11 computer with the internal and external dns (i.e. DNS: 10.10.10.51, 75.75.75.75) so that nslookup uses the internal dns first.

When I nslookup on the subdomain I get the internal IP that it is on.

When I ping (in Powershell), curl (in Powershell), or open the URL in a browser, I get "could not find host" and "The remote name could not be resolved" types of errors.

When I modify my windows hosts file to have the IP and name of the subdomain (i.e. 10.10.10.52 dev.ecommerce.ad.mydomain.com), then ping, curl, and my browser are able to access to the webpage.

I am not sure what step I am missing here.
 
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