Whenever I try to host a maptools game, 2 players can usually connect--but players 3, 4, and 5 generally have difficulty. Unfortunately, there doesn't seem to be any consistency: the player who connects effortlessly for one session is out in the cold in another. I am running with DSL on a slightly older machine. I'll happily post details if need be. Just now I'm wondering whether to go back to firewall-digging (I certainly thought I had my port forwarded correctly!) or if I'm simply exceeding the capability of my hardware.... Is this possible?
Well. Either port forwarding. Is working or it's not..and it is or there would be no players.. Check the network FAQ. There is a section about network card setting which is almost certainly your issue(or a sucky ISP)