Something must be blocking the ports... Well, try to completely disable your PC firewall for 5 minutes and try again. What firewall do you use?
A friend of mine couldn't make it work just because his ISP blocked those ports (and more, too, just for what ... ). Contacted his ISP, they've opened the ports and everything worked.
The ''user-device'' there is the computer the ports are opened on and I have to put my LAN IP there, but I can only choose my computer and can't manually put an IP in the slot.