The server that was hosting the game expired, unfortunately I couldn't get back in contact with the host and eventually just let it lapse.
I lost interest in D-M-O! for a number of reasons. The main being constantly having to explain why I don't just put the old version up.
At this time I am unsure what the future of D-M-O! will be, there appears to be enough Yu-Gi-Oh! games on BYOND to cover it's absence.
If I decide to continue developing games, it will probably be towards original games that can at least make a small return and not constantly be looked down upon by the greater community for being a 'fangame'.
I am sorry it has taken so long to post this, I've been avoiding a decision over the project.