X-Forwarding via SSH with Win10 and XcSvrc

Linux (Ubuntu) Server Core 16.04

sudo nano /etc/ssh/sshd_config

#add the below 2 lines 

X11Forwarding yes 

X11UseLocalhost no 

#!restart the SSH server

sudo service sshd reload

From the logs of the XcXsrv gather correct DISPLAY= value

(II) GLX: Initialized Win32 native WGL GL provider for screen 0
winClipboardThreadProc - DISPLAY=127.0.0.1:0.0 <<<<<<<<<<<<<<<<<<<<<<<<<
OS maintains clipboard viewer chain: yes

Add the X Server value into yours Putty configuration :

 env DISPLAY=hostname:10.0

You can verify with:

xauth list

env | grep DISPLAY

Unset incorrect enviroment variable:

env --unset DISPLAY