Greetings,
I also have this problem but i'll start from the beginning. i've had my 60g ps3 for almost 2 yrs before i tried to get online. I finally got Charter(cable) about a month ago and my initial efforts resulted in dns error 80710102. After contacting Sony, the tech had me disable the media server connection. I tested the connection and connected immediately! I've been playing online with no problem for about a month. Then I get the bright idea to try the ethernet port on the cable/phone modem in my living room. I brought the ps3 to it, tried to connect to no avail. Fine. I returned to my bedroom to reconnect and now it won't work. (same error). I have been back and forth with Sony and my isp but no luck. I am just running the ethernet to the ps3. No router or anything that could interfere. My isp says they do not block any ports. I am at a loss and am really in need of a madden "fix". Withdrawal is setting in and I don't know how long i can last. Please help.