enumerating session when hosting map

[Whistlergal]

I would like to try out my first map with others now that it is pretty much done. I have tried to do the port forwarding in my modem and entered the numbers given for that. However, while I can play my map, others can't get into it and get the message enumerating session when trying to enter.Any suggestions? In the launcher game settings I have checked the med mod and 1.6.9.2 version but still no luck. I have even tried to enable DMZ hosting in my modem.