I have the exact same problem. The only difference is I transferred a character from EU DC to OC DC for the beta test and am now unable to log into EU and OC DC and any time I try to log into either I get error message 3084. Connecting to NA and JP DC is possible without any issues.

I have tested this on different PCs with wired and wireless internet connections and the error keeps occuring. I was hoping maintenance would fix this, but even after maintenance I still keep getting the same error message.