The issue arises when a user tries to launch the Modern Warfare game but encounters the following message: Error: You have been disconnected Error Code: 664640 You can fix the error code 664640 by trying the solutions discussed below but before that, make sure the Activision servers are up and running. Moreover, check if linking (or re-linking) your account to the PC/console account (try at your own risk as you can lose some data or games while linking or re-linking the account) solves the Modern Warfare issue.
1. Restart Your Device and Networking Equipment
A temporary communication glitch between your device and Activision servers may cause the error 664640. In this case, restarting your device (like PS4) and networking equipment (e.g., router) may solve the Modern Warfare issue.
2. Update Modern Warfare to the Latest Built
You may encounter the error code 664640 in the Modern Warfare if its installation is outdated and updating the Modern Warfare game to the latest built may solve the problem. For elucidation, we will guide you through the process for the PS4 version of Modern Warfare.
3. Change the Region in the Game
The Modern Warfare game may show the error code 664640 if the region you are trying to play is not optimal for your device. In this context, changing your region in the game’s settings may solve the problem. For illustration, we will discuss the change of region process for the Battle.net launcher.
4. Change the DNS Settings of Your Device
The Modern Warfare game may show the error code 664640 if the DNS settings of your device are not properly configured and changing the DNS settings of your device may solve the Modern Warfare issue.
4.1 Change the DNS Settings of Your PC
4.2 Change the DNS Settings of PS4
5. Restore Licenses on the PS4 Consoles
A temporary communication glitch may cause an access issue for your PS4, resulting in the error code 664640 for Modern Warfare. In this scenario, restoring licenses on the PS4 consoles may restore access to Modern Warfare and thus solve the issue.
6. Delete the Modern Warfare Folder in the Documents Directory (PC Version Only)
The Modern Warfare may show the error code 664640 if the Modern Warfare folder in the Documents directory is corrupt. In this scenario, deleting the mentioned Modern Warfare folder may solve the issue at hand. If the issue persists, then you may create a new Activision account on the website, log in to Modern Warfare by using the new account, and then revert to the main Activision account to check if that resolves the issue. If that did not do the trick and you are using an Xbox console, check if creating a new Xbox user, switching to it, and reverting to the old Xbox account solves the Modern Warfare issue. If not, then you may reset Xbox to factory defaults to clear the error 664640.
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