If you are using a router try the following:
-Set port forwarding on your router to your Playstation 3. Call of Duty 4: Modern Warfare uses ports 3658, 3478, 3074, 3075 (UDP) and ports 80, 443, 5223 (TCP).
-Place your Playstation 3 into the DMZ of your router.
-If both fail disconnect your router and try the game. If it works regularly at this point something about your router may not be completely compatible with the specific needs of this game. Check with your router manufacturer for additional steps that may need to be done to resolve the issues you are seeing.
NOTE:If setting port forwarding or DMZ helps your gameplay you may wish to assign your Playstation 3 a static IP address inside your home network, this will help ensure that the configurations you made do not need to be redone.
NOTE: Many broadband internet modems are coming with routing capability built in. Please contact your internet service provider to determine if your internet modem has an integrated router, if it does they should be able to assist you with the steps above for setting up a router.
Once you have verified that your network setup is not the cause of the issue you can try the following:
-Try a different server. Some servers may have other players connected to them that you do not have an optimal connection with the host. To do this simply exit the game and select "Find Game" again in the multiplayer main menu.
-Back out to the main menu and re-enter multiplayer, then attempt to join a new game.
-Set port forwarding on your router to your Playstation 3. Call of Duty 4: Modern Warfare uses ports 3658, 3478, 3074, 3075 (UDP) and ports 80, 443, 5223 (TCP).
-Place your Playstation 3 into the DMZ of your router.
-If both fail disconnect your router and try the game. If it works regularly at this point something about your router may not be completely compatible with the specific needs of this game. Check with your router manufacturer for additional steps that may need to be done to resolve the issues you are seeing.
NOTE:If setting port forwarding or DMZ helps your gameplay you may wish to assign your Playstation 3 a static IP address inside your home network, this will help ensure that the configurations you made do not need to be redone.
NOTE: Many broadband internet modems are coming with routing capability built in. Please contact your internet service provider to determine if your internet modem has an integrated router, if it does they should be able to assist you with the steps above for setting up a router.
Once you have verified that your network setup is not the cause of the issue you can try the following:
-Try a different server. Some servers may have other players connected to them that you do not have an optimal connection with the host. To do this simply exit the game and select "Find Game" again in the multiplayer main menu.
-Back out to the main menu and re-enter multiplayer, then attempt to join a new game.
