As of 18.1 you should be able to bring a device up on Cellular primary first.  Is it recommended, not necessarily. A lot of things happen when you first power on a Meraki device, firmware upgrades, configuration etc... if the cellular connection isn't stable, it could make life harder than it needs to be.  Bringing it up over hardwire is best practice, but not a hard prerequisite anymore. ... View more

To clarify, Bonjour forwarding can be used to have mDNS cross L3 boundaries Bonjour Forwarding - Cisco Meraki Documentation   However from my experience, it can be a bit unreliable/slow. ... View more

Just so you and others are aware that having green ticks in meraki and no errors on the DC doesnt necessarily mean its working. Are users being picked up in event logs area and are group policy based rules hitting those users correctly as per whatever setup you have? Doesnt appear to be universally fixed in my environment with all green etc, still have broken MX boxes not pulling user data and applying group policies as they should. ... View more

Thanks @KarstenI. I appreciate the information and link you provided! ... View more

I had the same problem in the status informed ok "green", when I went to check in the event logs, Event type informed that: "Unable to contact domain controller " alternating between "Connected to Domain Controller" . To solve this I checked that in the "domain admin" field I didn't need to inform the domain followed by the \ Put only the domain user name. ... View more

the logs go to a collector(the server set on Meraki portal) and from there to a third party data processor. 3rd party says that they get the silent alarm as they dont recieve logs from some devices.I dont have access to the collector but before raising it with the MSP, I was wondering if I could check the Meraki portal to see if any logs were generated from those devices on those specific days. ... View more

I really hope Meraki will switch to using the Talos database (as everything else within the Cisco universe does). Way better accuracy and much more to „see“. ... View more

I would use Task Manager on those machines, and sort by the "network" column.  Then you can isolate it down to an individual process using the traffic. Otherwise, there are so many things it could be. ... View more

Note that this also means that your PLC's won't be able to initiate connections to the "machine". This is fine if all communication is initiated from the "machine" (because the firewall is stateful), but if not, you're better off doing what @jdsilva said. E.g. PLC needs to get a new firmware over TFTP from the "machine". ... View more