[root@p4ht ~]# pup
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

Traceback (most recent call last):
  File "/usr/sbin/pup", line 31, in ?
    import gtk
  File "/usr/lib64/python2.4/site-packages/gtk-2.0/gtk/__init__.py", line 76, in ?
    _init()
  File "/usr/lib64/python2.4/site-packages/gtk-2.0/gtk/__init__.py", line 64, in _init
    _gtk.init_check()
RuntimeError: could not open display