Denial of service attacks are bringing down the domain
http://mubos-md.com, home to, among other things, the SmartSig forums.
Denial of Service attacks (DoS or DDoS for short) are caused by high traffic intentionally aimed at one server. Wolf, a member of smartClan (which hosts certain resources on the domain), theorizes it's either Nikoking or Kikio.
The actual SmartSigs and license leveling system are functioning as normal.