The Fix is in this thread are you people blind or what, its only a temporary fix as it disables the DLC but lets you join game after game after game, if you want to play the DLC maps then just put the files back in the folder.
read this thread to see how to do it.
The way to make it work. Close the game, open steam, go to your library, click on (highlight) mw3 mp, click on the big PLAY button, you know the one, it has a little mouse on it. Disable DLC using the disable dlc button, or pressing F1, join a non-dlc lobby. If you leave that lobby and want to still play close the game and re-start the game using the same button within steam.
Good luck and have fun!
After all tips I found here I could play 3 games until I got another error like main/iw_25.iwd is different from the server so I copied it back and now I can't play any game again as before WTF I mean I paid for DLC and now can't play at all and it seems like noone cares
Anyway why should we change anything in files to play ???? we paid for something that should work didn't we ??????
I AGREE !!
I have been mailing STEAM for 3 days now and they sent me back to Activision.
THIS DLC is such A FAIL !! ALLO ACTIVISION WAKE UP
HOW CAN THEY CHARGE 15B FOR THIS DLC HAVING SO MANY ERRORS/ISSUES.
I use to find a game in 10 sec with more than 50 local games + FANTASTIC PING and NOW I FIND MYSELF WITH 2/4 GAME AND THE WORST LAG EVER - IS IT NORMAL THAT I AM NOW PLAYING WITH A PREHISTORICAL PING ?
--------> ALLO ACTIVISION I AM PLAYING IMAGES !!! DO YOUR JOB AND CHANGE THINGS IMMEDIATELY
Why cannot we play on local games anymore ? WILL IT STAYS LIKE THIS ?
PLEASE LET ME KNOW BECAUSE I WILL BE PLEASED TO GIVE MY MONEY TO ANOTHER GAME DEVELOPER
EXTREMELY IRRITATED CLIENT READY TO PLAY ANOTHER GAME
Ok.. Here is what I tried when same error appear when trying to connect to dedicated servers.
REMOVE CONFIG: NOT WORKING
VERIFY INTEGRITY OF GAME CACHE SP AND MP: NOT WORKING
RE-INSTALL GAME: NOT WORKING.
Sometimes it is working. and when you can connect.. next time when you tried connect again.. same problem appear.
Here's what they are saying in Twitter.
Someone asked: srsly it seems like IW doesn't give a **** about PC community.
We do. We're looking into the PC issues. I'm sorry it's frustrating