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They've already added several updates since the release last week - if you're still having issues, it could be your port settings for your Router. Your PS3 and the PSN, as well as MW2 need to have specific ports open for proper communication between servers and systems. If you're not sure how to do it, check my long post on the subject in the PS3 forums - it's had good reviews and a lot of personal thanks. Link is below.

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15y ago

What else can I help you with?