HelpCant connect to Online Services [After Update]

Hello, well.. as the title says, i cant connect to online services on MW3, have no idea why, my brother can, (not same computer) so im guessing my firewall is blocking it? but it worked before the update and i havnt changed anything since update :/ any1 have a fix?

Check steam setting VAC status.

I have same problem.
It says :banned from some secure servers because of a cheating infraction.

i think you are blocked from all their secure servers.

i'm looking also for a solution.

i read something like alterMW3 multiplayer.. but i'm not a specialist.

so anywone help for us ,,,???

---------- Post added at 06:23 AM ---------- Previous post was at 06:21 AM ----------

this latest update ban allot of cheaters.... i think we will lose this fight.