Hi Chris,
Thank you for sharing the details. Actually, DC Agent will have intelligence to switch to Secondary IP (DC Server Internal IP) automatically if Primary IP address i.e Public IP is not reachable or failed.
Hence, even though Public IP is not reachable internal still communication will work once clients are inside the corporate network.
Let me know if you need further clarification/assistance.
Regards,
-----
Jai Kishan
Sr. Technical Consultant
Desktop and Mobile Device Management Solution
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