I'm having a problem with my router. I try to connect to Xbox live, and it connects to the internet, but cannot connect to xbox live because it says my ISP is blocking the connection, all of a sudden. It's been working fine up until just recently (actually, when I got the Dawn of War 2 beta with Games for Windows Live in it). It tells me to open ports 3074 and 88, which I do. I have the ports opened on the firewall and the virtual server, and I even tried to DMZ the Xbox 360's IP address to make extra sure. I pretty much did everything I can do to open the line between my router and the console. It still doesn't work. I try using an ethernet cable instead of the wireless reciever, same thing. What makes even less sense is that I can connect to Games for Windows Live on my PC just fine (and it's connected to the router), and the PS3 connects just fine too, but my Xbox 360 can't connect to Xbox Live.
I guess all that's left to do is call my ISP and ask what's up, but does anyone know of anything else that could be wrong? Is it my router? Why did it all of a sudden change up? Maybe I need to replace it completely and totally re-set up the network, or maybe my ISP will clear everything up.