CYGWIN

cygwin X:
ssh root@hostName
ssh -Y -l userName hostName

xauth -v list
xauth generate 85.168.55.132:0.0 MIT-MAGIC-COOKIE-1

start x in cygwin : C:\cygwin\usr\X11R6\bin\startxwin.bat
then log on remote linux : ssh root@hostName
excute a X application : xclock

To run Gnome, KDE at remote m/c :
Modify REMOTE_HOST at : C:\cygwin\usr\X11R6\bin\startxdmcp.bat
run : C:\cygwin\usr\X11R6\bin\startxdmcp.bat

route : tracert

#at windows Cygwin-X
xhost +
# at server
export DISPLAY=myHost:0.0
xclock&