Bru - read here...

[MadMojo]

... about FW settings

http://www.techjawa.com/2011/11/09/guid ... warfare-3/

hope it helps....

[ReyEscudero]

OMG

[SouthAfricanBru]

I don't know where the settings are for this modem

[MadMojo]

It seems to me that the game reports a NAT status within it's multiplayer options, right? What does it tell you there?

Modem or not, that article shows where to look and what to do within the Win7 firewall:

Open up Windows Firewall with Advanced Security and create new Inbound and Outbound rules for “iw5mp.exe” (Located in Steam\steamapps\common\call of duty modern warfare 3\) and be sure to explicitly allow all connection both inbound and outbound.

The default location for iw5mp.exe is as follows…

C:\Program Files\Steam\steamapps\common\call of duty modern warfare 3\iw5mp.exe

If you’re on a x64 system, it will be similar, just inside the Program Files (x86) folder instead.

Restart your PC for good measure and fire up the game one more time and verify your NAT type is now Open.