Additional causes for the error may include congested servers, planned maintenance, an outdated version of the game, corrupted game files, and conflicts with certain software applications. Nonetheless, we have put together a straightforward guide to delve into this error and offer effective remedies.
Troubleshoot Prerequisites
Solution 1: Clear Console Cache
Clearing your console’s cache can eliminate corrupt data possibly fixing this problem. For PlayStation: For Xbox:
Solution 2: Verify Game Files
Corrupt or missing game files can lead to issues such as game launch failures and server connection problems. Verify your game files through the appropriate game launcher. For Steam: For Battle.net:
Solution 3: Port Forwarding
Network errors could be at the root of the issue. Configuring port forwarding on your router might enhance the connection between your gaming device and the MW3 servers. For port forwarding instructions, visit: https://appuals.com/port-forwarding-netgear-routers/ Here are the ports you should configure for COD: MW3: Call of Duty: Modern Warfare III – Steam
TCP: 3074, 27015, 27036UDP: 3074, 27015, 27031-27036
Call of Duty: Modern Warfare III – PC
TCP: 3074, 4000, 6112-6119, 20500, 20510, 27014-27050, 28960UDP: 3074, 3478, 4379-4380, 6112-6119, 20500, 20510, 27000-27031, 27036, 28960
Call of Duty: Modern Warfare III – PlayStation
TCP: 3478-3480UDP: 3074, 3478-3479
Call of Duty: Modern Warfare III – Xbox
TCP: 3074UDP: 88, 500, 3074, 3544, 4500
Solution 4: Allow MW3 Through Windows Defender
Interference from security software could also be inhibiting connectivity for the game. Adjusting Windows Defender settings to permit MW3 might address this problem:
Solution 5: Contact Activision Support or Your ISP
In case none of the solutions provide a fix, it might be time to seek further assistance by contacting Activision’s official support. Submitting a support ticket can also aid developers in examining the issue more closely and potentially releasing a patch for a permanent resolution. Should you find that connectivity issues extend beyond this particular scenario, it’s likely a broader network problem. In such cases, reaching out to your Internet Service Provider (ISP) and detailing the problem can be beneficial.
