How do I get call of duty modern warefare2 for ps3 online to work?

Every other game I have I can play online no problems. I just bought call of duty modern warfare 2 for ps3 today and when I go to play online, it comes up with a screen where it says it's surching, updating me skills and whatnot and just sits on that screen forever, never loads! How do I get it to work? I noticed under special opps it won't allow me online either, says error. Can someone help me, have this problem too?How do I get call of duty modern warefare2 for ps3 online to work?
You may need to open some ports for it on your router if you have one.

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