nethack.xd.cm, the server that hosts DynaHack and a number of other NetHack variants, has moved to the new domain nethack.dank.ninja.
The in-browser web terminal (hterm) is back, so you can watch and play just by visiting the server website.
Live chat, gameplay and development updates can be found in the #nethack.dank.ninja IRC channel on freenode.net.
Links across the site have been updated accordingly.