Bug#852397: Problem resolved with latest Cygwin Xorg server

I recently tested connecting to Debian Stretch from Debian Jessie via XDMCP and had no problems. That and the passage of time led me to look to see if a newer Xorg server was available from Cygwin and there was. I just downloaded the latest Cygwin Xorg server, version 1.20, and it connects to

Bug#852397: Alternative display managers

After not being able to actually find the particular problematic interaction between Debian 9 lightdm and the cygwin XWin server, and after a bit more thought, I thought I'd investigate possible workarounds. The main point seemed to be whether or not some other display manager would exhibit

Bug#852397: Update, cygwin Xwin X server required to produce problem

I've recently returned to this issue to see if time has resolved anything. I've updated Debian 9 to 9.2 and Cygwin to November 2017. Just to give an idea, Debian 8.7 X server reports version 1.16.4, Debian 9.2 reports 1.18.4 and cygwin 1.19.4. But time hasn't resolved anything, the problem is

Bug#852397: lightdm does not display a greeter dialog when accessed via XDMCP from a cygwin XWin server

Package: lightdm Version: 1.18.3-1 I attempt to connect via XDMCP to a machine running Debian Sid/Stretch from a remote cygwin based Xserver. The remote session starts and displays a black screen with nothing but a mouse cursor in the very middle. The mouse cursor then jumps to the upper left