I am having the same problem it started 4 or 5 days ago but up until then it worked fine. All other games let me join matches.
Could you give us some more information to work with? What exactly happens when you search for matches, does it happen all the time? What is the NAT setting on your network, etc.
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Depending on your NAT setting, could be the reason why you are experiencing difficulties. there is also that rare chance that the cd could be scratched in just the right spot