Cell data (e.g. 4G) sometimes uses NAT which blocks peer-to-peer connections. It's a problem with how the carrier has implemented 4G. The multiplayer tutorial covers the subject in the first part.
Thanks for your answer but this is a big problem, in this case many players that uses 3G or 4G (over NAT) cant join multiplayer game.
in manual it says:
"There are several other variants of NAT, including large scale NAT applied to entire regions, ISPs, or mobile networks, and some are more restrictive than others. Unfortunately this means in some cases connections are not possible, particularly if both the host and the joining peer are behind highly restrictive NAT. However with common setups players can usually connect to each other, and generally the closer they are geographically the more likely the connection is to work and provide good quality service."
what does it mean by saying "However with common setups players can usually connect to each other"??
is there something I can do to increase connecting chance via NAT (like mobiles connect via 4G that uses NAT)?
what is the solution? is there any way? if yes please help with with giving a refrence link, etc
thank you very much