Modern Warfare 2 - Installation Error,patch_mp.ff, in-game freezes lag

Latest entries on our list of known CoD MW2 errors, solutions & workarounds

32. Installation Error (53) COD: MW2- Multiplayer.

Installing 1.0.174 patch from 1.0.172 gives an Installation Error (53) CODMW2: Multiplayer.

Shut your Anti Virus Program down untill MW2 is patched / installed correctly.

33. MW2 updated to 1.0.174 patch, now patch_mp.ff is wrong version.

Download and replace with http://www.mapmodnews.com/filemgmt/index.php?id=210

(Back-up your org. patch_mp.ff in case above new one doesn't work either.)

34. Modern Warfare 2 menu and in-game freezes and lag-spikes

The 'Cooperdale' fix :

(Win 7) 

When you first start the game the firewall will ask if you want to allow it to access your network.

If you answer yes, this should create two rules in the advanced section of the firewall control panel.

One rule is for udp, the other for tcp.

1. If you block both but have upnp enabled on the router, you'll have nat strict.
2. If you enable udp, you'll have nat open.

There is no need to enable tcp, and if you do you'll get the freezes and lag spikes.

So tcp incoming needs to be blocked with your firewall, whichever it may be.

With this firewall/router configuration you get no port scanning, ergo no freezes, with an acceptable degree of security.

Full forum topic with more examples and solutions can be found  here

35. Can't find or hardly any Modern Warfare 2 MP games in playlist .

1. Sometimes it works just to let the game finding games. Then suddenly, can be more then 10+ min later, it gives : "Playlist has an update, the playlist update will be downloaded".  After that you can find games.

or

2. Clear the Modern Warfare 2 exceptions and re-apply MW2 MP/SP in the Windows Firewall.

Full list of ALL Call of Duty Modern Warfare 2 Errors - Freezes, Crashes and Install problems