@Harlock No, you cannot migrate from controller to stand alone, nor can you migrate from stand alone to controller mode, they are two completely different systems.

@Harlock If you want to go back to stand alone, you have to configure everything again, you have to delete the router from the Omada controllers and the router will be reset to default.

@David-Mc if you try from an OpenVPN client from the pc then? does it work? vpn ip pool should not overlap any of the other networks you have, use an ip pool that is not in use elsewhere

@David-Mc Which OpenVPN Server are you using? If you import the OVPN file to your PC, do you get a username and password or just a password when you log in to the OpenVPN server?

@Mike876 I can confirm, All VPN has significantly lower speed. but it is not necessary to buy a new router to downgrade :-), log in to the router with SSH and type enable, then roll-back

@Chrisasnyder I did a test with one of the kids who has an ER605v2 and multiple vlans, I disabled the router ACL one way but didn't get any ping, I disabled the router ACL both ways, no ping, so I...