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Hello dear Gamer, first it's a pleasure to be able to help you today.

My name is Vinicius.

I am a gamer and independent advisor on the XBOX community platform.

Hey MaskedManPhil, how are you today? Hope you're well.

I believe it's an issue with your NAT connection and TEREDO protocol.

Press the Windows button on your device or keyboard, or select the Windows icon in the lower left corner of the main screen.

Select Settings > Games, then select Xbox Network.

In Xbox Live Multiplayer, check Nat Type.

If anything like TEREDO can't qualify or Server blocked appeared, MaskedManPhil, try to do this:

Call your internet service provider, and ask them to open the ports described below on your router.

Port 88 (UDP)

Port 3074 (UDP and TCP)

Port 53 (UDP and TCP)

Port 80 (TCP)

Port 500 (UDP)

Port 3544 (UDP)

Port 4500 (UDP)

Also ask to disable and then, enable it again the UPnP function and if you have a modem and a router the process has to be done on both devices.

Besides, ask them to put their PC's IP in the DMZ zone configuration.

To locate the IP of your PC: On the taskbar, select Wi-Fi network > the Wi-Fi network you're connected to > Properties.

Under Properties, look for your IP address listed next to IPv4 address.

Hi, William! thank you for reaching out.

My name is AJ, I'm an Independent Advisor for the Xbox Community.

I'm sorry to hear you are experiencing issues with some of your games.

I believe additional information is needed.

If you don't mind, please answer the following questions.

• To clarify, are you getting this error code from Call of Duty games? if so, may I ask which ones?

• May I ask which Xbox model you are using?

• Are you experiencing issues playing other online games?

Thank you! I'll be looking forward to your reply.

Best regards.