You can do the capture on the Meraki side from the Meraki. On Windows all you  need to do is install wireshark.  https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Packet_Capture_Overview https://documentation.meraki.com/General_Administration/Tools_and_Troubleshooting/Getting_started_on_Packet_Captures_with_Wireshark That may help you, Meraki support may be able to help to some extent, but if the issue is on Windows it may be best effort.     ... View more

If you cannot configure your upstream firewall/router, then there is nothing you can do that will make this work in a proper way. ... View more