I think I should have added the note to the topic xD
When using DxWnd you are only allowed to add clients that belong to private servers.
Every other original maplestory clients as GMS, EMS and such have a gameguard or other
hacking shields like Ahn Lab, which think that DxWnd is a hacking tool and dc you from the game. Though you will never get banned for it, only get the notice.
So you shouldn't use it for GMS, only for private servers xD