Exceed behind NAT

Tunnel X through SSH with PuTTY

Run PuTTY.‎
Before connecting, select under "Category":‎
"Connection"->"SSH"->"X11"
Check "Enable X11 Forwarding"‎
Click "Session"‎
Connect to the server (X11 client).‎
Run Exceed in Passive Mode:‎
Tools->Configuration->Communication->Mode: Passive