Hello @Nik1 The MX/Z Firewalls run connection monitoring tests to monitor the connection on the WAN side. These include, ARP requests to the local gateway, ping to 8.8.8.8, DNS resolutions for meraki.com, google.com and yahoo.com and Dashboard Connectivity tests. If anyone of these fails, the error would be shown on the appliance Uplink. Bad Gateway means that the ARP response from the gateway is possibly having issues getting to the Z3. https://documentation.meraki.com/MX/Monitoring_and_Reporting/MX_Client_Connectivity_Monitoring https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/Connection_Monitoring_for_WAN_Failover Please let me know if you have any further questions. Regards, Meraki Team
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