If you are experiencing connectivity issues attempting to play a Call of Duty game on a PC, your first steps should be to check the Steam Support page and server status of the Call of Duty game you are playing.

If the status for the Call of Duty game you’re playing is not at DEFCON 5 indicating that all online services are fully operational, you may encounter lag or connectivity issues until the status has returned to DEFCON 5.

If the status for the Call of Duty game you’re playing is at DEFCON 5, there are a number of steps that you can take to improve the quality of your connection.

Run through the basics
Here are a few things to note before delving any deeper:

  • Restart your router – Often the easiest and quickest way to resolve connectivity issues.
  • Network bandwidth – Avoid other bandwidth-heavy applications on your network while playing online, including but not limited to streaming music or video content, or downloading files.
  • Wired connections – You will achieve optimal performance when playing an online game over a wired Ethernet connection. Wi-Fi connections have a wide variance in reliability and bandwidth, and can dramatically affect the quality of online gameplay. Wired connections will maintain the minimum bandwidth connection that is required for online gaming.

Test your home networking
The following tests require you to log in to the router on your home network to troubleshoot your network. You will need your router’s login credentials to proceed. If you do not have your router’s login credentials, you will need to contact your Internet Service Provider.

These tests refer to options that are typically found in a router’s menu. If you cannot find what you’re looking for, please refer to your router’s manual.

You may not need to perform all of these tests, so be sure to test the game after attempting each one.

If you are on an institutional (school), corporate, or other shared network, please refer to your network administrator for further assistance.

Test 1: Universal Plug and Play

  • Turn Port Forwarding off (if it is turned on) and enable Universal Plug and Play (UPnP).
  • Check your new settings in game. If this doesn’t resolve your issue, proceed to the next step.

Test 2: Port Forwarding

  • Turn UPnP off.
  • Turn Port Forwarding on. Learn more about Port Forwarding.
  • Assign a Static IP address to your console.
  • Check your new settings in game. If this doesn’t resolve your issue, proceed to the next step.

Test 3: DMZ

  • Turn Port Forwarding off.
  • Assign the console’s Static IP address to your router’s DMZ.
  • Check your new settings in game.

If the tests above do not resolve your issue, please contact your Internet Service Provider for further assistance, or refer to the following: