How do you get your mw3 multiplayer working again in the new update?

To get your Modern Warfare 3 (MW3) multiplayer working after a new update, first ensure that your game is fully updated by checking for any pending downloads in your game client. Next, verify the integrity of the game files through your platform (like Steam or Battle.net) to fix any corrupted files. If issues persist, consider reinstalling the game or checking online forums for any specific fixes related to the latest update. Lastly, ensure your network connection is stable, as connectivity issues can also affect multiplayer access.