To Action From
2100/tcp ALLOW IN Anywhere
9990/tcp ALLOW IN Anywhere
2100/tcp (v6) ALLOW IN Anywhere (v6)
9990/tcp (v6) ALLOW IN Anywhere (v6)
ip addr
inet 192.168.0.174/24 brd 192.168.0.255 scope global dynamic noprefixroute wlan0
Looks good to me. 
Seems you only need to forward / open port 2100.
Maybe check if the setting for the lobby server is correct in the config file.
masterserver_name=lobby.wz2100.net
In which folder is this file located? I can’t find it even with the locate command
Don’t know. I’m not playing that game.
The README says there is some config setting though.
When you are hosting a game it will automatically be listed on the lobby-server. If you do not want your games to be listed on the lobby-server, you have to change the entry "masterserver_name=lobby.wz2100.net" in your config to some- thing invalid as "nomasterserverplease"
So there must be some config file somewhere.
I’m sure the internet search-engine of your choice would be of some help… Or maybe seek some help on their forum.
From a networking standpoint, things look ok to me.
I searched and found this site but it doesn’t say where the file resides with this string Sophie: warzone2100-2.3.5-1mdv2010.0 i586
moreover even if I find the string I would not know what to do.
I also assumed that everything was ok with the internet part in the sense of open ports and stuff, but I would not know what to do to fix nor where to find that string.
Maybe if you have a command like grep to search for strings in files I can try to search the whole computer.
In any case there is no folder in home I found a .warzone2100 also in home.