Could you translate to American? jk
Is he playing on a regular home network?
Also:
"I had loads of connection problems.. Could maybe log into 1 of 15-20 servers i tried.
I then opened each port "manually" (DMZ did not work with BF4) TCP: 80, 443, 9988, 20000-20100, 22990, 17502, 42127 UDP: 3659, 14000-14016, 22990-23006, 25200-25300 After I did this, I haven't had a failed login once. All successful atempts!"