Game DNS is now .
The setting is saved, but your worlds are still handing players the old
address.
Each world writes the address into its own QuickConnect file, and that file is
only rewritten when the world is updated. Until then players who join through
QuickConnect will still be sent to the previous hostname.
Update every world to finish the change. Any world you do not
update keeps the old address.
Nothing else about your worlds changes, and players already connected are not
disconnected.