export DISPLAY=10.11.251.9:0.0
yum install xorg-x11-xauth.x86_64 xorg-x11-server-utils.x86_64 dbus-x11.x86_64

/etc/ssh/sshd_config:

# AddressFamily any
AddressFamily inet

AllowTcpForwarding yes
X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes