Whereas some affected Modern Warfare II players are reporting that after installing a patch update quite recently, this specific Error Code 2901 started appearing. If we talk about the error message, “Lobby Not Found – Check the code and try again. Error cause: 10. Error code: 2901” seems to appear to the unfortunate players on the screen. As already mentioned above, here we’ve shared some possible workarounds for you that should come in handy. So, let’s get into it.
1. Force Close MWII and Retry Again
No matter whether you’re playing your Call of Duty: Modern Warfare II game on the PC or gaming consoles, it’s suggested to simply force close the game and retry again. In most cases, a normal reboot of the game might fix several issues with the game application whatsoever.
For PC:
- Just force close and exit the game > Go to Task Manager (Ctrl+Shift+Esc).
- Click on Processes > Select the MWII.exe task from the list.
- Select End Task to close it completely.
- Now, reboot the PC to apply changes.
- Finally, launch the game again via the respective client.
For Consoles:
- Press the home button on PlayStation or Xbox controller.
- Go back to the console’s main screen or home menu.
- Now, select Call of Duty: Modern Warfare II.
- Press the Start button > Select Close Application.
- Now, restart the console, and re-launch Modern Warfare II.
2. Run MWII as an administrator
You can try running the Call of Duty: MWII game application on your Windows PC as an administrator to allow the User Account Control (UAC) access to the system. Otherwise, you might encounter startup crashes, server connectivity errors, etc. To do so:
- Go to the installed Call of Duty: Modern Warfare II game directory on the PC.
- Right-click on the game application file on your PC.
- Next, click on Properties > Click on the Compatibility tab.
- Click on the Run this program as an administrator checkbox to enable it.
- Once done, click on Apply and then OK to save changes.
- Make sure to run the game to check for the issue.
3. Check the Network Status
The chances are also applicable that your internet connection is somehow having an issue with the slow speed or stability. It’s better to run a speed test of the connected internet online and try playing other multiplayer games. If in case, there is an issue with the internet connection at your end, try switching to a wired (ethernet) connection from Wi-Fi or vice versa to cross-check the issue.
Make sure to contact your internet service provider (ISP) to get it checked, and ask to fix the issue. You can also switch to a different ISP or upgrade to a higher plan.
4. Check the COD Modern Warfare II Server Status
It’s also recommended to check for the Call of Duty: Modern Warfare II server status info in real-time from the official Activision Online Services webpage. Once you visit the page, make sure to select the Modern Warfare II game in the list and hit the Refresh option to cross-check if the online services are operational for all platforms or not. If there is an issue with the online services or server status then just wait for a couple of hours before trying again.
5. Update the MWII Game
An outdated game patch version on the PC can trouble you a lot in terms of the game connecting to the servers online. You should always check for the game update manually by following the steps below to get additional features and improvements.
For Battle.net: (PC)
- Open the Battle.net desktop app on your PC.
- Click on the COD: MWII game.
- Next, click on the Settings menu (cogwheel icon) > Select Check for Updates.
- Wait for the update process to be completed.
- If there is an update available, you should download and install the update.
For Steam: (PC)
- Open the Steam client > Go to Library.
- Click on COD: MWII from the left pane.
- Now, Steam will automatically search for the available update.
- If there is an update available, click on Update.
- Just wait for a while until the update completes.
- Once done, reboot the PC to apply changes.
For PlayStation:
- Turn On your PS4/PS5 console > Go to the Home screen.
- Now, navigate to the main menu on top.
- Head over to the Games tab.
- Scroll down and select Call of Duty: MWII.
- Press the Options button on your controller.
- Finally, choose to Check for Update from the drop-down menu.
For Xbox:
- Make sure to turn on your Xbox One or Xbox Series X|S gaming console.
- Press the Xbox button on your controller to open the menu.
- Now, scroll down to the right > Select Settings.
- Scroll down until you see Updates & downloads.
- From the next page, select Keep my console up to date and Keep my games & games up to date to enable the checkbox.
6. Repair the MWII Game Files
In some cases, corrupted or missing game files on the system can trigger several issues with the game launching and server connectivity in most cases. So, verifying and repairing the installed game files via the launcher might help a lot. To do that:
For Battle.net:
- Launch the Battle.net client on your PC.
- Click on the COD: MWII > Choose Settings (cogwheel icon).
- Select Scan and Repair > Click on Begin Scan.
- Wait for the repair process to complete it.
- Once done, reboot the PC to apply changes.
For Steam:
- Launch the Steam client > Click on Library.
- Right-click on COD: MWII from the list of installed games.
- Now, click on Properties > Go to the Local Files tab.
- Click on Verify Integrity of Game Files.
- You’ll need to wait for the process until it gets completed.
- Once done, restart your computer.
7. Check for Graphics Driver Updates
An outdated graphics driver version can eventually trigger multiple issues with the graphics-hungry program running smoothly. So, updating graphics drivers on your Windows system is always required to run all the programs smoothly. To do this:
- Right-click on the Start Menu to open the Quick Link Menu.
- Click on Device Manager from the list.
- Now, double-click on the Display adapters category to expand the list.
- Right-click on the dedicated graphics card device.
- Select Update driver > Choose Search automatically for drivers.
- An update will automatically download and install the latest version if available.
- Once done, make sure to reboot your computer to change the effects.
Alternatively, you can manually download the latest graphics driver version and install it directly from the official website respective to your graphics card manufacturer. Nvidia graphics card users can update the GeForce Experience app via the official site. Meanwhile, AMD graphics card users can visit the AMD website for the same. Intel graphics card users can visit here.
8. Check for Networking Driver Updates
An outdated networking driver on the computer can also cause several issues with the online server connectivity. It’s better to check for the networking driver update on the PC and install the same by following the steps below.
- Right-click on the Start Menu to open Quick Link Menu.
- Click on Device Manager from the list.
- Now, double-click on the Network Adapters.
- Right-click on the networking device > Select Update driver.
- Choose Search automatically for drivers.
- If there is an update available, it’ll automatically download and install the latest version.
- Once done, make sure to reboot your computer to change the effects.
9. Disable Windows Firewall and Antivirus Protection
It seems that you’re using the default Windows Firewall protection on your PC to maintain the security level. However, in some cases, Windows Firewall can have trouble accessing online content by connecting to the servers. It’s recommended to temporarily disable the Firewall program by following the steps below.
- Click on the Start Menu > Type Windows Defender Firewall and open it.
- Next, click on Turn Windows Defender Firewall on or off from the left pane.
- Select the Turn off Windows Defender Firewall (not recommended) option for all domains.
- Once done, click on OK to save changes > Reboot your PC to apply changes.
You should also turn off the Windows Defender antivirus program temporarily on your PC to ensure there is no issue with the game file blocking. To do so:
- Press the Win+I keys to open Settings.
- Click on Update & Security > Click on Windows Security.
- Click on Open Windows Security > Go to Virus & threat protection.
- Now, click on Manage settings > Just turn off the Real-time protection toggle.
- If prompted, click on Yes to proceed further.
Please Note: If you’re using any other third-party antivirus program on your PC then ensure to turn it off from its settings menu.
10. Uninstall and Reinstall Modern Warfare II
Though uninstalling the Call of Duty Modern Warfare II game and reinstalling it again might not be a good option for most of us, there is actually you can do nothing in this scenario. It’s always better to try reinstalling the game on the PC or console properly to cross-check if the specific problem is still bothering you or not. Mostly it should help in restoring the default configuration and other necessary files in the game to run the application properly.
For PC:
- Click on the Start menu and search for Control Panel.
- Open Control Panel > Click on Uninstall a Program.
- Locate and right-click on Call of Duty: MWII > Select Uninstall.
- If prompted, click on Uninstall again to confirm.
- Wait for the uninstallation process to complete. You can follow the on-screen instructions to do so.
- Once done, make sure to reboot the PC to apply changes.
- Finally, head over to the Steam or Battle.net client and reinstall the MWII game.
For Xbox:
You should also try uninstalling and reinstalling the COD MWII game on your Xbox console by following the steps below.
- Press the Xbox button on the controller to open the Guide menu.
- Select My Games and Apps > Hit See all > Choose Games.
- Then select the Ready to install tab > Select Queue.
- Select the Call of Duty Modern Warfare II game that you’re trying to reinstall.
- Now, press the Menu button on your controller.
- Select Manage game & add-ons or Manage app.
- Choose Call of Duty Modern Warfare II > Select Uninstall all.
- Make sure to select Uninstall all to confirm the task.
- Wait for the uninstallation process to complete.
- Reboot the system to apply changes.
- Then press the Xbox button on the controller to open the Guide menu again.
- Hit My Games and Apps > Select See all > Go to Games.
- Select the Ready to install tab > Hit Install for COD MWII.
- Wait for the installation process, and then restart the console.
For PlayStation:
Uninstalling games from PS4/PS5 is easy. You can follow the steps below to do so:
- Navigate to the Call of Duty: MWII game in the Games Menu.
- Highlight the specific game and press the Options button on your controller.
- Now, select Delete from the menu > Confirm your selection & your Modern Warfare II game will be uninstalled.
- Once done, reboot the console to apply changes > Head over to the PlayStation Store and reinstall the game again.
- It should resolve the Modern Warfare 2 Error Code 2901 for you.
If none of the workarounds did come in handy then make sure to contact Activision Support Twitter and Infinity Ward Twitter handles to check for further details regarding the server connectivity issue. You should wait for a couple of days or weeks until a new patch update is released to fix this error. In the meantime, you can keep checking the Twitter pages regularly.
That’s it, guys. We hope you’ve found this guide useful. Feel free to ask in the comment below.
