They're using the native vpn client, we couldn't get other clients to work with Meraki. Btw, I found the solution, I checked the firmware as suggested yesterday and it was already running the Beta version but it wouldn't allow me to roll back to the latest stable version (something about the Beta being installed for too long).   I noticed that scheduling a firmware downgrade was allowed, so I gave it a shot, firmware downgraded successfully and now the VPN is working almost as expected.    I'm still having issues with AD authentication but at least Meraki's built in authentication method works. ... View more