well hopefully this may shed a light of hope for someone in this forum. I had the same problem that everyone here is describing. Basically i tried to wait it out, jsut watch tv or turn it on and leave it searching all day for when i came home, well my stepmom actually found a fix that is extremely simple, goes like this:
if when u click the find game option and it shows a grey box with "downloading game settings..." perfect! if you are connected through a router, all i did was disconnect my routers power cable for about 5-10 seconds, and plug it back in so all the lights will blink off on the router, wait 10 seconds and plug it back in(described 2 times btw, only unplug once). for some reason when u unplug it, it resets the internet connection, now go back to your ps3 which you leave at the find game, barracks, party invite, etc... main online screen while you reset the cable, press your PS button and quit game. Once at ur ps3 menu go back into COD:4 and load it up once more, this time when u go to online join game? it will ask u to sign in first, accept the sign in, if it fails to sign you in its ok, that should happen, Retry, then once it signs you in the whole main screen will be frozen with the box "downloading game settings..." let it go for the 5-15 seconds it takes and it will load up again, when u click join game all should be fine.
I hope you understand this and it worked for me GL all
