Unable to connect to host in mw3

[Inn3rs3lf]

Hey guys,

So, I have been trying to invite friends into my party with mw3. I constantly get the error unable to connect to host. My NAT setting is moderate, so I dont see what the problem would be. Any freaking ideas on how to rectify this?

 

[MOnk]

Try read through these;

http://xifon.eu/mw3sa/mw3.html
http://forums.steampowered.com/forums/showthread.php?t=2232017

 

[Cranky]

some times its a error in mw 3 causing it .. quit and restart your game. and voila sorted