I have a DMZ setting on my home router. From what I understand, when enabling this, and setting the DMZ address, what ever client with that address is in the DMZ of my home router and therefore free of any firewalling. I couldn’t get my MX to register in the cloud, and a call to my friendly neighbourhood ISP, confirmed my suspicion. My MX was being firewalled, even though it was put in DMZ. And this was working by design. So, take a look at your DLink, and verify it isn’t firewalling your MX. And afterwards try adding the Meraki Firewall info, that is required for Cloud communication.
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