Sounds like the same firewall issues I was having.
Goto the network settings on the PS3 and run the "test connection". If the NAT Type is 3 it isn't going to work...you need it to be type 1 or 2. Type 1 essentially means directly attaced to the cable modem. Type 2 means it has a router in between but with the appropriate ports being forwarded to the your PS3.
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