RBR850 Port Forwarding Broken, Possibly Due to NAT Loopback Broken

This is an update to a previous discussion.  I've done extensive experimentation and I've attached a PDF with results.

TL;DR

Enabling port forwarding of HTTP to a target machine fails when accessing the public IP address from inside the local network.  Running IIS on target machine (called TARGET).  Testing access to server from 3 machines on internal network: WIRED, WIRELESS and TARGET.  As one might guess, WIRED is connected via Ethernet to the LAN, WIRELESS is connected via Wi-Fi.  TARGET is connected via Ethernet.

All machines can browse to http://192.168.1.25 (TARGET's local IP) correctly.

Only WIRELESS can browse to http://my.public.ip.  WIRED and TARGET get timeouts.

If have tried other wired and wireless machines on my LAN.  When accessing my public IP address, wired connections fail, while wireless connections succeed.

I also switched machine WIRELESS to Ethernet; it failed.  However, switching machine TARGET to Wi-Fi still fails.

See the attached PDF for a discussion of additional symptoms and why I believe the problem may be related to NAT loopback.

Thanks,

Michael