It is a domain account. Good call on adding the domain. I'll give that a shot. Yes, I am seeing an 'ACCESS_ACCEPT' message. I opened a ticket with Meraki support who said back end logs were showing authentication failure. Obviously that doesn't make a lot of sense given that radius is confirming the password. I've done a second capture on the MX lan port and confirmed that the MX is also receiving the 'ACCESS_ACCEPT' packet. UPDATE: I had been using my email account but I tested with 'username', 'public_domain\username', and 'private_domain\username' with no luck. In all three cases, the radius 'ACCESS_REQUEST' shows the correct value and radius completes the authentication.
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