New Patch

I think this has to do with their attempt to stop chaos ... they were saying a patch was coming to stop banned players from playing ... then i see this in the steam forums for MW3 by Valves BurtonJ.

"We're actively investigating a server outage that impacts AuthenticateUserTicket (part of the multiplayer authentication system). I will update this thread when we have more details or the issue is resolved."

So sounds like IW doesnt even know how their own game authenticates with steam, no wonder i see quotes like this flying around by their development team members
"Tina Palacios ‏@Teanah
@Fiki1591 hackers can't be banned with our current system since they, you know, hacked the game. don't fret. we're working on something"
LMFAO from a senior community manager...
source

---------- Post added at 06:00 PM ---------- Previous post was at 05:59 PM ----------

it should as they rolled back the patch



EDIT: according to the steam downtime notices a fix has been put in for the authentication issue, so likely the patch will be pushed again shortly. I do love how steam is covering for IW failure to implement proper coding.

yup bud - the patch has been patched by a patch,which isnt a new patch - its and old patch, the patch we had before - wow - im all patchy !!! ,anyway the new new patch that replaced the new patch - is our old patch and the game works and we can play for now lol

I hear after they released it, shortly after they downgraded back to 1.9.453....
And you need to go back to that to find games....Idk how true it is though.

That is exactly what happened, although I believe it automatically downgraded you again.