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 Debian Stretch via 
XDMCP just fine. Therefore, I consider the problem to now be resolved.

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