How to Fix ‘Logging into Online Services’ Error in MW3?

The “Logging into online services” error often arises from network issues that can disrupt the connection between a player and the game’s servers. Server overloads during significant content drops in MW3 may trigger these errors. Furthermore, suboptimal performance from your home network can also provoke errors such as “Logging into online services”.

Additional causes for the error may include congested servers, planned maintenance, an outdated version of the game, corrupted game files, and conflicts with certain software applications.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

  1. Check Server Status: Your game could be encountering this error due to scheduled maintenance. Verify the game’s server status on Activision’s Online Services page.
  2. Restart Your Game and Computer: Begin by restarting your game; if the issue persists, proceed to restart your computer.
  3. Restart Your Network Devices: Temporary glitches with your router or modem could be the culprit, so attempt a restart.
  4. Check and Disable VPN: While a VPN can prove useful, MW3 servers may not support VPN usage during gameplay. If active, disable your VPN and recheck for issues.
  5. Manually Check for an Update: Console players may sometimes miss an auto-update, leading to errors. Ensure that you check for updates manually and install any available.
  6. Keep Retrying: Continue to retry by launching the game repeatedly, as this may resolve the issue according to several user reports.

Solution 1: Clear Console Cache

Clearing your console’s cache can eliminate corrupt data possibly fixing this problem.

For PlayStation:

  1. Completely shut down the console.
  2. Disconnect the power cord.
  3. Wait 10-15 minutes before restarting the console.

For Xbox:

  1. Press and hold the power button for 10 seconds.
  2. The Xbox will perform a hard reset, wiping the cache in the process.

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:

  1. Open Steam and navigate to the Library section.
  2. Right-click COD: MW3 and select it.
  3. Choose Properties and go to the Local Files tab.
  4. Select Verify Integrity of Game Files.
  5. After the process, reboot your computer and try to launch the game again.


  1. Launch
  2. Find COD: MW3 and click the gear icon next to the title.
  3. Choose Scan and Repair.
  4. Once finished, restart your machine and attempt to launch the game.

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:

Here are the ports you should configure for COD: MW3:

Call of Duty: Modern Warfare III – Steam

  • TCP: 3074, 27015, 27036
  • UDP: 3074, 27015, 27031-27036

Call of Duty: Modern Warfare III – PC

  • TCP: 3074, 4000, 6112-6119, 20500, 20510, 27014-27050, 28960
  • UDP: 3074, 3478, 4379-4380, 6112-6119, 20500, 20510, 27000-27031, 27036, 28960

Call of Duty: Modern Warfare III – PlayStation

  • TCP: 3478-3480
  • UDP: 3074, 3478-3479

Call of Duty: Modern Warfare III – Xbox

  • TCP: 3074
  • UDP: 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:

  1. In the search bar, look for Windows Defender Firewall and open it.
  2. Select Allow an app or feature through Windows Defender Firewall from the left menu.
  3. Click on Change Settings then choose Allow another app….
  4. Press Browse and navigate to your MW3 installation folder.
  5. Identify and open your game’s executable file (.exe).
  6. In the MW3 row, tick both the Private and Public boxes and click OK.
  7. Restart your computer and verify if the issue is fixed.

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.


Hamza Mohammad Anwar

Hamza Mohammad Anwar is an intermediate JavaScript web developer with a focus on developing high-performance applications using MERN technologies. His skill set includes expertise in ReactJS, MongoDB, Express NodeJS, and other related technologies. Hamza is also a Google IT Certified professional, which highlights his competence in IT support. As an avid problem-solver, he recreates errors on his computer to troubleshoot and find solutions to various technical issues.