Hi Bas, I've seen similar issues with Galaxy Dimension panels before. Since it's pingable and the RSS (Remote Service Suite) is working, have you checked if the port forwarding for the Gx app (usually port 10001 or 5001 depending on your setup) is correctly configured on the router? Sometimes the app requires a more stable handshake than the RSS. Also, double-check if the 'Remote User' codes have the proper 'App Access' permissions enabled in the panel manager.