d.mon

   Xlib: Client in not authorized to connect to server
   Graph_Set: cant open :0.0

and the second batch is from the system ( i.e. OS) as follows:
   X11/NeWS Network security violation
           Rejected connection from: smokey.forestry.utoronto.ca (128.100.163.2)
   For more information, see the xhost(1) and xauth(1) man pages

  This is a common problem which occurs when you use grass (or
  any other graphic program) in a remote machine... because the
  remote machine attemps open a window in your local machine...

  you must do "xhost +" in your local machine
  and in the remote machine
   "setenv DISPLAY (the e-address of your local machine):0.0"
  in csh or
  "export DISPLAY=(the e-adrress):0.0" in ksh

  good lock

  Nelson Segura
  Concepcion
  Chile.