Most likely, if you're dealing with older devices, you'll be using the per-device licensing model. You have 90 days to activate the license after purchase. If it's not activated within 90 days, the license automatically becomes effective on the 91st day. This model allows you to assign licenses to specific devices and has different expiration dates. On the other hand, if your company uses the co-termination model, as soon as you add new devices to your network, you'll see a change in the expiration date of your license. Do you know what licensing model you are currently using? ... View more

I tried many possible solutions (checked the Meraki config, the OS versions, my firewall, etc), but realized it was only some client computers that were causing this problem, so I tried your advice. I connected a USB NIC to the computer and it worked instantly. ... View more