@akut If possible, it is easiest to bind to a cloud website, bind a TP-Link ID and you can manage it remotely. With a configuration like your current one, you need to ensure that both your PC and...

@SaXaR I've seen similar posts before(same error message), the troubleshooting steps are quite detailed, you can refer to them. https://community.tp-link.com/en/business/forum/topic/531182 But if...

@Grenon55 You can refer to the latest version on the EN official website and download the EU version, the firmware files are the same....

@DmitryG It seems like the mostly reason is the changing of the controller V5's ports. Suggest you can check whether Port 29810-29814 is opening in your network. And this article may help you:...

@RV_1234 Suggest you can change the CPE's LAN IP to the same subnet IP as your router's, like 192.168.1.222.

@Alex789 It also depends on the situation. The most classic topologies have a very detailed FAQ which you can read briefly： https://www.tp-link.com/support/faq/3091/