To my knowledge, es is on a completely different infrastructure entirely; which is why it isn't blocked.
I'm pretty sure es' service is provided by someone other than the retards over at yahoo.jp
Hence why you can still connect to it, but not PC/Vita PSO2.
I can connect to and play on es with no trouble, but cannot connect to either of the regular PSO2 services (or pso2.jp).
I am also east coast, and my ISP is Comcast, who's service regarding this issue has been absolutely abysmal, not that I can really blame them, the high-end techs I've spoken to pretty much told me flat out that it was mostly out of their hands.
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