Just got a 360 slim, and I've been trying to get it to connect to my wireless network. My PS3 works fine, so does another PC in our house, but the 360 won't make the final connection to Xbox live. It connects to the internet, but then it won't connect to live. The error message says something about opening port 3074 on my firewall, but I did that. I even tried closing down the entire firewall. I've done basically everything. I spent 2 hours on the phone with tech support, up until the supposedly highest ranking tech person suggested I physically move my xbox around to see if that works and then I hung up.
If I plug an ethernet cable directly in, it sometimes works, but generally it still gives me the same bullshit about xbox live not working. I have a dell d-link router. Not sure what other info would help. If anyone has any ideas I'd appreciate the help.