Hello, HTTPort worked for me through a HTTPS (443) proxy if you let the external PC listen at port 443. If VNC can't be reconfigured to listen at that port, you may use Rinetd (www.boutell.com/rinetd) port forwarder to forward traffic from 443 to 5500(viewer listener) or 5900(server) HTTPort/HTThost works through a HTTP (80) proxy. www.htthost.com good luck