I decided to check how the latest XR500 Firmware (v2.3.2.56) handled its ports in respect as to whether they where STEALTH, OPEN or CLOSED – I ran the GRC Shields UP tool and was pleased (relieved) to see that for firmware version XR500 v2.3.2.56 all ports are in Stealth mode when probed..
I also ran the Universal Plug n Play (UPnP)Internet Exposure Test also provided by http://www.grc.com and the XR500 with firmware v2.3.2.56 did not respond to any unsolicited UPnP probes, which is good 
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In a completely sane world, madness is the only freedom (J.G.Ballard).
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