/etc/ssh/sshd_config
  
  echo -e "X11Forwarding yes
  X11DisplayOffset 10  
  X11UseLocalhost yes" >> /etc/ssh/sshd_config

Restart SSH
  /etc/init.d/ssh restart
Install xauth
  apt-get install xauth -y

Configure xauth
  touch ~/.Xauthority && xauth generate :0 . trusted
  xauth add ${HOST}:0 . $(xxd -l 16 -p /dev/urandom) && exit
Run your app
  ssh -X root@mymachine app