Even if the server is empty
Instance server is not the same as the map server, if there are too many people trying to do dungeons and it hit the capacity of creating new instances i would guess that is the server response for the over load.
Even if the server is empty
Instance server is not the same as the map server, if there are too many people trying to do dungeons and it hit the capacity of creating new instances i would guess that is the server response for the over load.