have you been able to play in that server for a very long time? before all this happen getting punted out of the server?
some maps will do that if they been modded or the map has error in it.
try seekout the people who are hosting that server online
they are using a mod for there servers its Med mod for DF: BHD-TS
Source:
http://jointops.org/lobby/novalobby.php?lobby=bhd
click-on the server name it will tell all about the server
what i found is their own host site seem tobe down right now!
link:
www.tio.jedibhd.com
btw dfreload.com (i think thats is it) may have information about there servers as will, think one who like to join in the servers need to do it by lan connect not 100% on that
TIO Coop