Hi, we used to see similar behaviour with other non-Cisco meraki equipment and PLCs, almost everytime it was the result of the VLANs not traversing over the network.   Is the industrial network segmented from the admin network? Are you coming in on the admin network side and is there routes available to the industrial network?   If so, are the switches, firewall or something else blocking the VPN client protocol? Are there VLANs in place? can these VLANs route between the admin network and industrial network?   Essentially the PLCs should be on their own network assigned via VLAN, but untagged as in connected to an access port on the switch, work your way back from there. Is the client VPN subnet on a range that is conflicting? Do the PLCs have the correct IP address information including their gateway addresses.    Try working backwards from the PLC, or find out if there are any restrictions on the client VPN -    to me, it sounds like a route issue, and perhaps your microwaves do not have the ability to route VLANs across them, in which case you will need a L3 router on each end. ... View more