connect to X from other machines?

[Xu Qiang]

Hi, all:

I have got X Window system to work well as expected. Then I want to connect to it from other PCs installed with M$ Windows. I refer to the handbook and see this section: 

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5.6.4 Running a Network Display Server
In order for other clients to connect to the display server, edit the access control rules, and enable the connection listener. By default these are set to conservative values. To make XDM listen for connections, first comment out a line in the xdm-config file:

! SECURITY: do not listen for XDMCP or Chooser requests
! Comment out this line if you want to manage X terminals with xdm
DisplayManager.requestPort:     0
and then restart XDM. Remember that comments in app-defaults files begin with a ``!'' character, not the usual ``#''. More strict access controls may be desired. Look at the example entries in Xaccess, and refer to the xdm(1) manual page.
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I commented the line as suggested in the handbook, and then connected to it using X-Win32 from M$ Windows, to get the following error: 
???????????????????????????????????????????????????
XDMCP: Manager unwilling: Host unwilling
???????????????????????????????????????????????????

What else shall I do?

Thanks, 

Regards,
Xu Qiang