[gersultan]

ansonsten noch zu beachten:

If you have changed your router settings since the last time you
played Command & Conquer 3 Tiberium Wars, you will need to click
the "Refresh NAT" button in the game's Network menu. To do this,
in the Main menu select "Options" and click the "Settings"
button, click the "Network" tab, then click the "Refresh NAT"
button.

...

If you are experiencing general NAT connection difficulties, exit
the game, delete the options.ini file in your "Command & Conquer
3 Tiberium Wars" folder, restart the game, and click the
"Refresh NAT" button in the Network Settings menu.