[LightDM] Lightdm-mutlitple conncetion failed

[Fupy]

Hi,
        Here is the problem: I have enable XDMCPServer in My Debian Stretch and my configuration is as follows:
   [Seat:*]
A  greeter-session=lightdm-greeter
A  greeter-hide-users=true
A  session-wrapper=/etc/X11/Xsession


   [LightDM]
B  start-default-seat=false


   [XDMCPServer]
B  enabled=true
B  port=177


Sources:
A  /usr/share/lightdm/lightdm.conf.d/01_debian.conf
B  /etc/lightdm/lightdm.conf
        
           After configuration, I can remotely login into the XDMCPServer (My Debian Stretch) from 
my Windows 10 Desktop via Xmanager, or from my another my Debian Jessie laptop, both of 
them are in the private network of my Debian Stretch.


          However, after i login from local Debian Stretch, then I cannot login from the other xdmcp client (Windows and Debian Jessie).
The same for any of the three, i login from the Debian jessie, then i cannot login from local Debian Stretch and Windows 10.  If i first,
login from Widows, the other two cannot be logged from. So I just can log in from one of the three terminals.
         
        What is wrong with my setting, please give me some suggestions and where i start to solve the work.
    




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