I have this now. 3rd party FortiGate FW's terminating the outbound lines in front of Meraki Switches. Intermittent 'bad DNS' on multiple switches and Orange lights come and go on the front of the boxes as a result. Filtering is evident from a management laptop placed on the Management VLAN. I guess the Forti's are doing some rate limiting and killing the outbound DNS sessions on some of the switches depending how many sessions hit the filter at the time. Thanks for posting your experience this should allow me to get this addressed before all the users jump on and start moaning.
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