Smart plugs server error

Since I have changed my WiFI I can't connect to the smart plugs on the app,
I have removed the app, and reinstalled the app,
I have cleared the catch and still the same issue

Is it just your smart plugs or the rest of the system (battery/inverter/solar etc)? If it is all then I'm guessing you have changed your SSID and/or password for the wifi. If so, set them back to the previous settings and this should hopefully sort you out