I have seen that for the first time and not really could find any description about this DC!
Is there any list of DC's?
If no, what are you waiting for???
Or if there is DC list where it is?
In google I had no results about exatly this DC. Anyways, is it good idea for easy reachable and understandable lists of disconection kinds?

Disconnect 21 : IF there server is full (doesn't allow new chars)

Disconnect 34 : Internet problems Or Maintenance (This is a normal DC)

Have to wonder whats dc 42 :D