We use the Windows 11 built in client. Works well enough but occasionally it'll just randomly stop accepting connections. The only fix is to reboot the router which is not ideal in the middle of a  work day. To get around the issue i've had to setup PPTP VPN for the staff to use until we can reboot the router after hours.

There's no error in the logs to say rejection or anything it's just like the port is closed and Windows says the server is not responding. 

Not using controller just logged directly into the router. It's the only Omada device so didn't want to complicate things installing a controller.

Also why is there no official firmware updates for this model is it already EOL?