Overview
Ok so many people do not know there is dedicated servers in MW3. That is not true. The servers are turned off by default. Why that is i have no clue but any ways lets start.
What To Do
Step 1. When you first see the multiplayer screen it will have PLAY at the top and a few other things such as options.
Step 2. Click on options. on options you should see the things to set you controls and other things, but at the bottom of the option’s menu you will see a thing to click on saying something about dedicated. Click on that
Step 3. In that there will be two things that are defaultly set to NO. You need to change both of these to YES.
Step 4. Press esc and click apply settings. This most likely restart your game.
Step 5. Go back to the multiplayer menu where it says PLAY and look in the list for the word SERVER. That will then (once clicked) lead you to the dedicated servers.
Not Quite Sure what the pic next to the game i had to choose a file.