If you've had trouble playing online...

[Erik Rutins]

Make sure you grab this new update from the CSO Downloads page (get there from your Command Center):

MMCC3 REVISED plugin to improve H2H connectivity - Now Available! Description: Due to connection errors in h2h with MMCC3 a new build is available as a full plugin.

To install.

1. Make sure MMCC3 is not running

2. Backup any player.dat files you want to keep.

3. Then use ModSwap to uninstall MMCC3Multiplayer and install the new version


Changes made
1) Server now discovers real WAN IP address of the MMCC3 client.
2) Client now uses ports 1939 to 1945.


Users with routers/firewall should punch a hole in their firewall o­n these 6 ports so that MMCC3.exe can be a "TCP server" o­n these 6 ports.

Filesize: 0 Bytes
Added on: 15-Mar-2007
Downloads: 6
Category: Cross of Iron / Mods for Cross of Iron (Plugins)

[Yellonet]

Ports... [:D]

And hopefully I'll be able to try the online experience now [:)]

[Blond_Knight]

Finally able to connect to an opponent through MMCC3.  I did also have to open the port of the MMCC3 server(2108)

[Andrew Williams]

YES!!!
 
It works.
 
From the readme
 
Welcome to the Multiplayer Client for MMCCIII (Revised March 2007)
Ports 1939 to 1945 and 2108 to 2110 must be open/forwarded in your router/modem for this app. to function correctly.
You also must make sure your Firewall is allowing CoI to access the internet
CoI Ports
2300 to 2400 udp/TCP
6073 TCP
47624 TCP

[Andrew Williams]

http://www.closecombat.org/forums/showthread.php?goto=newpost&t=12802

[Blond_Knight]

ORIGINAL: schrecken

CoI Ports
2300 to 2400 udp/TCP
6073 TCP
47624 TCP

Hmm, I didnt have to forward those ports.

[Andrew Williams]

Some people can't play at all..MMCC3/BHQ/TCP without those ports forwarded 



I'm on a 4PC LAN and those ports are essential to gett CC to see the rest of the world.