Hi Vince!   This message doesn't indicate a specific issue, however it can be associated with a configuration mismatch of some kind. When the issue is occurring (when the tunnel is down) the MX will generate more useful logging messages that Meraki support will be able to help you interpret. If you're able to, it would be ideal if you can leave the tunnel in the broken state and call into Meraki support before the tunnel comes back up. We'll be able to better diagnose the issue if we can see the logs in real-time. Thanks! ... View more