When I enable Remote managament then port 80 is open, but I can't open it with forwarding options. Or any other port Please help this is really important to me. If this dont work I must return router...

I have raspberry pi connected to it and using ultra VNC and opening port 5900. Also some other ports for smart home app. I try online port checker, but also try to connect to my RPI with Ultra VNC...

Just bought this router and have the same problem that ports are not opened. Is this solved in any way? I have public IP on 3G data card. Tried MR3020 with, Huawei E3131, E173, E353 and no ports...