Diablo III – Meaning of Error 3004

diablo-3

While attempting to play the D3 beta, I'm getting error 3004 when attempting to start a game. This is happening after choosing my character, and clicking resume game.
Error message

This error message is very succinct, but I can't help but want more information. Is this an error from my end, or does it originate from Blizzard's servers? More details are needed so I know what action to take.

Best Answer

Servers are unavailable (most likely due to overload). (It's not you, it's them.) 3004 shows at character selection, 37 shows at login—same conditions.

Blizzard's official response: keep trying.