I checkd, it is Nat B. How can I change it?Directly from big N:
This error code generally indicates that your network is not optimal for peer to peer connections, this may be due to the ISP, Internet connection speeds, or due to your network's NAT type.
Check your connection NAT type in the switch's network settings. If it's "D" try another router.
My NAT B with 22.2 MbpsNAT B should be fine for online playing. Your downloads speed should also be over 3 Mbps.