There is no specifc error for your character is already logged in. when this happens you get the 30002 error again.

It's a 'ping' type error as far as i can tell. it just signals a time out, it doesn't specify what kind of time out. the string afterwards might, but only a dev can aswer that and they haven't been helpful. that doesn't necessarily mean they don't' want to. it could be they just dont' have access to every possible error code.

what i'm seeing happening (through you) is that you're trying to load in. your computer is telling the FFXIV server 'I am here!' and the FFXIV server is either 1) not getting the message, and you're timing out because you're not getting a signal back from the sever or 2) it's trying to send the signal back to you, but your'e not getting the signal back. so the server is saying 'I see you!' but ther's no signal saying 'Yay! we agree!'