Step 1: Check the Call of Duty Status Pages
Check the Server Status of the Call of Duty game you are playing:

Call of Duty: Advanced Warfare
Call of Duty: Ghosts
Call of Duty: Black Ops II

Step 2: Improve your Home Network Quality
The quality of a home network will have the biggest impact on game connection.
  1. Be sure to restart your router. This will often solve the issue.
  2. Make sure you are playing the game using a wired Ethernet connection. Playing a game using a wireless connection is the primary cause of lag and connectivity issues. Wi-Fi has a wide variance in reliability and bandwidth, and can dramatically affect the quality of online gameplay. A wired connection will maintain the minimum bandwidth connection that is required for online gaming.
  3. Disable any firewall or security features on your router. See your router’s instruction manual or visit the router manufacturer’s website for more details.
    2WireApple AirportBuffaloDynexMotorolaSiemensUS Robotics
  4. Enable Universal Plug and Play (UPnP) on your router. This will automatically route the correct data to the correct ports.
  5. Set port forwarding on your router to the IP address of your PC using port 3074 User Datagram Protocol (UDP). If there are multiple PCs on your home network, you can also redirect UDP ports 3074, 3075, and 3076 to the PC used for gaming (one port per PC). How to forward ports.
If the above steps improve your network connection to the game, you may want to assign a static IP address to your PC within your home network. This will ensure that the configurations you made do not need to be repeated. Please note that Satellite, hot spot, and 3G/4G internet connections are not considered broadband and are not supported.

Step 3: Change your Playlist Search Preferences
  1. Select Search Preferences from the Playlists menu.
  2. Change the Connection Type from Best or Any to the recommended Normal setting.
By clicking on any link to a third party site listed above, you acknowledge that Activision (1) is not the author of the site, nor a source, sponsor or endorser of the goods or services described therein, and (2) is not responsible for the content of the site, including if any information on the site leads to a product malfunction.