Firewall/NAT

Hello. I am new here.

Our MIG/PROXY equipment is supplied by our ISP and was given root access to the webGUI to configure as I need. (They seem to use some custom theme? version of m0n0wall, I think.)

I have setup an Apache webserver on an internal Windows PC at 10.0.0.22 and port 8800.

Accessing the Apache webserver on the LAN (ie. internally) on 10.0.0.22:8800 works as expected.

I am trying to access the webserver from another computer OUTSIDE the LAN (ie. from the Internet) as follow:

Internet -> Ext Ip of my MIG (41.xxx.xx.xxx:8800) -> Internal webserver on 10.0.0.22:8800
This just brings me to a "Page not found".

I have setup NAT PortForward and FW-rule as follow:

 (http://i.imgur.com/rEpBl.jpg)
 (http://i.imgur.com/QbR9v.jpg)

I am clearly missing something and would appreciate any help.

Thank you kindly.
Jamie.

That isn't a customized m0n0wall. It looks more like pfsense, but I see you have asked over in their forum already, and you have one answer there so far.