If you have manually setup all the port forwarding etc for XBox Live, you shouldn't need UPnP ? The last time I used IPv4 only, I only had to do the forwarding etc. as I never use UPnP. Then again I was using an ASUS Router, but I doubt if that should matter.
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When i do this it makes the NAT go to strict which is very confusing as it's supposed to do the opposite. I've opened all the ports required as advised by Bungie yet game still shows moderate Nat even though Xbox Companion shows strict or open? I've tried with router and windows firewall off/on and same results, can't get it to shift from moderate in game. Tried reinstalling apps, game and even reinstalling Windows with no success.
Tried with UPnP and without and forwarding ports manually also. I can play strikes occasionally but cannot fulfil my season pass or missions that require matchmaking such as iron banner, gambit etc.
Upon checking with port forward network utilities i can confirm ports are not being forwarded in DHCP mode and UPnP, they are in manual port forwarding but result is that the NAT goes strict from open and stays moderate in game.