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Make sure that you NAT TYPE isn't moderate or strict if so factory reset the modem/router and if that doesn't do it, go into your modem/router via PC and set your PS3 as a DMZ host. NOT: Setting you PS3 system as a DMZ host puts your console outside the firewall.
1-turn off game console..............2-disconnect router for 20 seconds then reconnect............3-turn on game console..............4-go to setting click on network setting.................5-go to internet connection and press X and disable the connection wait 10 seconds and renable the connection and cod4 should work fine on line.............................
my sign name on playstation is red4n2ec0kreaper look me up if you need more help
it worked for me and should work for you
It's the Call of Duty 4 Servers from uploading the Map Pack. Their are alot of players That have downloaded it recently, and it is lagging their Servers. If you just wait a little bit, the problem should be fixed and all set to go.
On the Ps3 that isn't working, go into the settings and see if there is something under it that is prevent invitations or friend requests. It will probably be under parental controls or network settings. If someone else hosts the game can that Ps3 join. Also try and get the messed up one connected by ethernet cable and not wireless, it may be cutting out as there are 3 ps3's and probably multiple computers hogging the signal.