XDMCP: Manager Unwilling: Host Unwilling

The error Xdmcp: Manager unwilling: Host unwilling that is displayed in X-Win32’s Messages window when you start an Xdmcp session means that the remote X Display Manager (e.g. xdm, kdm, gdm, etc.) is not allowed to manage an Xdmcp session for your machine. Typically you have to edit the Xaccess file in order to allow your host to connect.

Allowing all hosts to connect via Xdmcp

  1. Find Xaccess used by your display manager (typically this is located in /etc/X11/xdm)
  2. Edit the Xaccess file
  3. Find the line
    # * #any host can get a login window
  4. Uncomment the line, changing it to
    * #any host can get a login window
  5. Save the file
  6. Restart your X Display Manager by dropping to runlevel 3 then raising back to runlevel 5 (e.g. init 3 followed by init5), or run /etc/init.d/xdm restart on some Linux systems (SuSE, Debian, Ubuntu, etc.)