Exporting Linux Display

I have a linux server which is hosted and I want to be able to run graphical programs from my laptop behind my router.

Used XLaunch from Cygwin from here
Found the router IP address from my Router admin console
Forwarded a ports in my Router and ensured that only certain machines could use them
I enabled X11 forwarding in my PuTTY client

On the server whose display I wanted I exported the DISPLAY
export DISPLAY=<my router IP>:0.0
tested using xclock