I read a bunch all over the web prior to landing here (this thread was the most detailed and organized info I found)... I believe that particular comment relating to Xbox 1st gen and possible UPnP problems was from a Reddit post (but can't say for certain). There was no hard evidence as I recall, but it stuck in the back of my mind as I've toyed with this.
I'm still tinkering with this, but it seems as though clearing the UPnP table and soft resetting the Xbox's results in an Open NAT whenever one or both reverts to Moderate. Some games my son plays were opening secondary ports causing UPnP rules to clear so I have now increased my "Cleaning Threshold" from 3 to 10.
I'm still tinkering with this, but it seems as though clearing the UPnP table and soft resetting the Xbox's results in an Open NAT whenever one or both reverts to Moderate. Some games my son plays were opening secondary ports causing UPnP rules to clear so I have now increased my "Cleaning Threshold" from 3 to 10.