I'm using a Verizon Wireless mobile broadband connection, and connected just fine to both the website AND game server.
My traceroute through Comcast indicates that my connection is dying within Comcast's infrastructure. It's not even reaching Japan, which indicates that Comcast is doing something, or they are blocking connections to SEGA's infrastructure as a security measure.
Before jumping to an IP Ban conclusion, I would recommend running your own trace to pso2.jp and seeing how it plays out.
Connect With Us