Most likely your PortoBox bundle has expired or reached its usage cap. In this situation, The green light on your box should be turned off too (middle light). To make sure, you can go to your PortoBox admin panel at 10.0.1.1 > services > porto > server settings and check if your preferred server is set to disabled or you can go to client area and check your bundle status. To make your account enable again, you must purchase a bundle at the manage menu in the client area.