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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.
after endless hours of trying to play online we finally found out what the problem was -
check your discs you should have a serial on there if one ends in uk & the other ends in uk then you should be able to play together
if one ends i unk & the other ends in us then this is why you cnanot join or you cannot connect to host
This is the FIX
create another user then create another playstaion account now you both need to creathe this in unites states with another mail account - fill out the address in florida californail post code 90210 - once this is done youshould then be able to join up in the call of duty lobby but unfortunatley your stats are afresh
some games on the ps3 requires a 1mbps of upload most of the games are at 512 mbps wich most internet services are locked at 512 its a problem out there for ps3 users the internet providers wont go over 512 due the their bandwith allocation! wich means if they double everybodys upload then they will run out of stream for uploads and downlads!
espacially when you play games with over 14 multiplayers the 1mbps becomes crucial!
so i suggest talking with the internet service and check online the game you refer for upload requirement donload shoulbefine!