I still get "fail on testing" as well, but my current setup is a nightmare.
Arris modem @ 192.168.0.1 (DMZ to 192.168.0.2)
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Netgear N router @ 192.168.0.2 (DMZ to 192.168.0.3) (no DHCP or Routing functions)
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Netgear Dual Band N adapter @ 192.168.0.51
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PC Network Bridge @ 192.168.0.3 (this PC actually has perfect open ports using upnp and tested online, so I know this setup is capable to handle what I need it to do)
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Belkin Router set as Access Point only (no DHCP or routing functions) (DMZ setup to 192.168.0.7)
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Cisco Switch
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Xbox 360 RGH @ 192.168.0.7
My house is 2500 sq foot, Ive got 3 360's, an ATV, 2 PC's, a home media server, and my internet connection is actually hard wired into a Garage that is seperate from the house by 40 ft, (this is why there is a wireless segment in the network line) Ive just got to figure out how to get the RGH to upnp properly THROUGH the bridged connection on the PC located at 192.168.0.3